An Introduction to PLC 英语介绍

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PLC的英文作文

PLC的英文作文英文：PLC (Programmable Logic Controller) is a type of industrial control system used to automate various processes. It is widely used in manufacturing, packaging, and assembly industries. As a PLC engineer, I have been working with PLCs for many years and have gained a wealthof experience in programming and troubleshooting.One of the advantages of using a PLC is its flexibility. It can be programmed to perform a wide range of tasks and can be easily reprogrammed if changes are needed. For example, in a manufacturing plant, a PLC can be programmedto control the speed of a conveyor belt, the temperature of an oven, and the pressure of a hydraulic system. If the production process changes, the PLC can be reprogrammed to accommodate the new requirements.Another advantage of using a PLC is its reliability.PLCs are designed to operate in harsh industrial environments and can withstand extreme temperatures, humidity, and vibrations. They are also equipped withbuilt-in diagnostic tools that can detect and diagnose faults, making it easier to troubleshoot and repair problems.However, there are also some challenges when working with PLCs. One of the challenges is the complexity of programming. PLC programming requires a high level of technical knowledge and expertise. It also requires a deep understanding of the specific application and the process being controlled. Therefore, it is important to have a well-trained and experienced engineer to ensure that the PLC is programmed correctly.Another challenge is the need for regular maintenance. PLCs are electronic devices that can be affected by wear and tear, as well as environmental factors. Regular maintenance is essential to ensure that the PLC is functioning correctly and to avoid downtime. This includes checking for loose connections, cleaning the system, andreplacing worn-out components.In summary, PLCs are an essential part of modern industrial automation. They provide flexibility and reliability, but also require technical expertise andregular maintenance to ensure optimal performance.中文：PLC（可编程逻辑控制器）是一种用于自动化各种过程的工业控制系统。

PLC工程师的英语自我介绍

PLC工程师的英语自我介绍Hello!My name is****School of engineering cost management profession al students.It is an honor to participate in this interview,four years of university s tudy and life,I have strict demands on themselves,hard-working,hard-working,pragmatic and systematic study of engineering cost based curriculum knowledg e,and achieved excellent results.I have always been diligent,conscientious,and actively adapt to the environment,and make unremitting efforts for their own sel f value.The college has served as student union Vice Minister of the Propaganda De partment of the organization,has the strong organization ability,activity plannin g ability,communication ability,and have good language skills and team spirit,w ork together with the Department Director at the University,jointly organizing an d planning a number of large and medium-sized Youth League activities,and ach ieved very well,get the praise of teachers and administrators.Honesty is my personal principle,I believe that my ability is good enough for most of the position,I love the business of your company,sincerely look forward to your leadership,the building blocks for this glorious cause;and continuous lea rning,progress in practice.I am***College of engineering construction project cost manageme nt syst em of professional students.During college,I with outstanding achievements,th e school has won a comprehensive,nationalmotivational scholarships,and has b een rated as"excellent students"honorary title,in order to meet the needs of pr ofessional knowledge.In the cost of the specialty,I studied engineering costcontrol>and<<<>,engineering economics,municipal engineering measurement and valuation","co nstruction project measurement and valuation>,<installation><Engineering Measurement and valuation,contract management and bidding>,<>buildinghitecture.The school often do professional curriculum design,and carries on the scene a week to observe the internship site,with senior engineer Huang workers learni ng and practice,grasp the application of theodolite on the site,the test block of concrete,steel banding and familiar with reinforcement diagram,the solution sh ould handle construction visa etc..Theoretical knowledge and practice in school t ogether,more full grasp of professional skills.The study,I participated in many so cial practice activities,to exercise their own hard work,strict in demands of wind.Modern society is in need of compound talents of combining theory and pra ctice.I will through continuous learning to improve themselves,to prove himself i n practice.Strive to realize their value of life,to contribute to the development of your :Mr.X sex:Male Marital status:unmarried MiaoNationality:Residence:Hunan-Jishou age:25Location:Guangdong-Dongguan height:163cm Hope:Guangdong That position:Electrical/electronics components-Electrical Engineer Position:Electrical Education experience 20xx-09~20xx-07 of Shaanxi University of Science and Technology haojingc ollege electrical engineering machine automatio。

Introduction of PLC

1. A programmable logic controller (PLC), comprising a processor unit for sequential control of a process and for data communication with at least one external system, which PLC is arranged to execute tasks cyclically during sequential control, in each cycle a given period of time being available to each task, said tasks comprising a user task for executing an application program and a communication task for taking over control parameters for the application program which have been acquired during data communication with the at least one external system, the ratio of the durations of the periods available to the execution of the communication task and the application program being adjustable during the execution of the application program.2. A programmable logic controller as claimed in Claim 1, in which the duration of the period available to the communication task can be adjusted via the application program.3. A programmable logic controller as claimed in Claim 1 or 2, in which the period available to the communication task is adjustable within predetermined limits.4. A programmable logic controller as claimed in Claim 1, 2 or 3, in which the processor (CPU) comprisesa first processor (SCP) for sequential control and a second processor (DCP) for data communication with the at least one external system, and a communication unit (MBX) for communication between the first and the second processor.5. A programmable logic controller as claimed in Claim 1, 2, 3 or 4, in which the external system whose control parameters acquired during the communication task originate from a user console and/or a programming system and/or another programmable logic controller and/or a central computer.Description:The invention relates to a programmable logic controller (PLC), comprising a processor unit for sequential control of a process and for data communication with at least one external system, which PLC is arranged to execute tasks cyclically during sequential control.Generally speaking, a PLC is a (micro)processor or a system of (micro)processors for the execution of a specific task, for example the monitoring and control of a process. Such a process may be the control of a machine as well as of a complex of collaborating installations. For correct operation it is necessary to execute a number of tasks while responding to signals originating from the process or system to be controlled and to control parameters from, for example a user console. The various tasks to be executed in a PLC are carried out in a fixed order; during a cycle (to be referred to hereinafter as the PLC cycle) a given amount of time is made available to each of said tasks.The tasks in a typical PLC cycle are: general overhead, required for correct operation of the programmable logic controller; writing of data, for example signals from the system controlled; execution of the user task, i.e. the processing of the signals entered so as to form control signals for the system; output of the control signals; external communication, for example with an operator console and/or a central computer. The length of the period assigned to each task is fixed, so that the total cycle time is fixed and hence also the total response time (TRT) of the programmable logic controller. The totalresponse time is the time elapsing between the instant at which the value of one of the input signals changes and the instant at which this change influences the outgoing control signals.Moreover, the PLC should communicate with an external system, for example a user console, in which case it is necessary not only to write control parameters of the external system but also to check these parameters for mutual consistency and consistency as regards the instantaneous state of the process or system to be controlled. After completion of this check and adaptation of the parameters, if necessary, during the execution of the communication task the new values must be transferred to the part of the processor which can be accessed by the user program.In a conventional system as described above, the TRT may be subject to fluctuations because the number of operations to be carried out during the user or communication task may vary, for example in dependence on the values or the changes of the input signals and/or control parameters to be taken over. For example, it may occur that the communication time of several PLC cycles is required so as to take over a completely new set of control parameters. Consequently, much time is spent on the execution of the application program without the new parameters being (fully) taken into account. During this period a number of PLC cycles elapse without useful control being performed, leading to a serious increase of the response time of the system.If, in order to avoid this situation, the communication time is fixed as the maximum time required to take over the parameters, it will often occur that this time is not completely necessary, so that many PLC cycles have an idle period in which no task whatsoever is performed. This also slows down the operation of the PLC.It is inter alia an object of the invention to provide a programmable logic controller in which the duration of the PLC cycle amounts to at the most a time desired by the user, in which idle time in a cycle can be simply avoided and the execution of cycles which are useless with respect to control can be reduced.To achieve this, a PLC in accordance with the invention has the property that in each cycle a given period of time is available to each task, said tasks comprising a user task for executing an application program and a communication task for taking over control parameters for the application program which have been acquired during data communication with the at least one external system, the ratio of the durations of the periods available to the execution of the communication task and the application program being adjustable during the execution of the application program. In situations where it is expected that the user task will require a large amount of time or where interruptions of the user task must be minimized, for example during a time-critical phase of the operation of a machine, the time for the communication task is adjusted to a low value.In cases where a change of the control parameters can be executed without seriously disturbing the process, the time for the user task may be comparatively shorter and that for the communication task comparatively longer. In a non-critical phase of the process or machine control, this aspect is not detrimental to the system being controlled, so that the increase of the total response time is not objectionable. In comparison with a system in which switching over to a system task must wait until even a prolonged user task has been completely executed, a PLC in accordance with the invention offers theadvantage that the cycle time variation is predetermined and is long only in specific circumstances as desired by the user.In a preferred embodiment of the PLC in accordance with the invention the duration of the period available to the communication task can be adjusted via the application program. This is advantageous because in the application program it is known whether the controlled system or process is in atime-critical phase or not and when a large amount of new data is to be expected. This aspect is taken into account in the allocation of the communication time.In an embodiment of the invention the period available to the communication task is adjustable within predetermined limits. If the communication time has a minimum value unequal to zero and is also bound to a maximum, the communication task as well as the user task is activated in each cycle. It is thus ensured that, via the communication task, the user program can always be influenced from the external system.In a further embodiment of the invention the processor (CPU) comprises a first processor (SCP) for sequential control and a second processor (DCP) for data communication with the at least one external system, and a communication unit (MBX) for communication between the first and the second processor. Using two, task-specific processors in the PLC, the data communication with external systems and the control of the controlled system are executed in parallel. This means an acceleration of the sequential control of the controlled system.These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.In the drawings: Fig. 1 shows a block diagram of a PLC with components of a system to be controlled which are coupled thereto; Figs. 2a and 2b show the various types of tasks in a PLC cycle; Fig. 3 shows a flow chart of an application program for a PLC in accordance with the invention.The block diagram of Fig. 1 shows a programmable logic controller PLC which is coupled, for example via a serial bus SBS, to a number of sensors S1, S2, ... whereby signals of a system to be controlled (not shown) are measured and entered into the programmable logic controller PLC. The programmable logic controller PLC is also coupled to actuators A1, A2, ..., for example via the same serial bus SBS, in order to apply control signals for the system to be controlled thereto. Besides a single bus SBS, separate buses for input signals and control signals are also feasible. Apart from coupling to the serial bus SBS, with which the programmable logic controller is coupled to the controlled system, the controller is also coupled to one or more external systems.Shown are, by way of example, a user console or man-machine interface MMI for entering instructions and displaying the state of the controlled system and the logic controller, a programming and debugging system PDS for programming and testing the controller, an external computer system HST, and a connection to other logic controllers via a network NTW.The programmable logic controller PLC comprises a central processor unit CPU with one or more storage modules and an interface module IFC to the serial bus or buses SBS. The storage modulescontain inter alia a system program and an application program. The processor unit CPU can be subdivided into a section SCP which performs the sequential control of the controlled system, via sensors and actuators, and a section DCP which handles the data communication with the external systems NTW, HST, MMI and PDS. The latter section not only reads the parameters presented by the various external systems, but also checks these parameters for mutual consistency and solves conflicts, if any.Figs. 2a and 2b diagrammatically illustrate the execution of the tasks during a PLC cycle. Fig. 2a shows the execution of the tasks in case one processor is available which executes process control as well as data communication with external systems. Fig. 2b shows the execution of the tasks for process control if a separate processor is available for data communication. The sections DC1 and DC2 in Fig. 2a indicate when the processor exchanges data with external systems for the entering and execution of parameters, respectively. To this end, a driver DRV is activated from time to time. Furthermore, the parameters are checked and written into the appropriate storage locations in the logic controller. When the controller executes the blocks INP, USR, OUT, COM and FMW, the sequential control tasks are performed.During the block INP, analog and digital signals from the sensors are read; the block USR indicates that this information is processed in conformity with the instructions in the application program. Upon execution of the block OUT, calculated control signals are applied to the actuators. During the block COM, data is exchanged between the sequential control task and the data communication task. During this task data blocks are exchanged between the section dedicated to control and the section dedicated to data communication, for example by writing and reading in a memory accessible to both tasks. This exchange cannot take place continuously, because the sets of control parameters whereto the application program reacts would then be inconsistent. Finally, in the block FMW a so-called firmware program governs the internal processing of the controller.The firmware program ensures that commands entered via the parameters are executed in program blocks during the data communication task in as far as permitted by the allocated time. This is realized, for example via a look-up table stating for each command or program block how much time is required for the execution thereof. If not all commands can be executed within a PLC cycle, the other commands are postponed until the next cycle. Thus, the execution of the various commands is not interrupted when the allocated time is exceeded.Fig. 2b shows the same for a system comprising two processors. In the left-hand part of the Figure the tasks INP, USR, OUT, COM and FMW of the sequential control processor are given. The right-hand part of the Figure shows that the data communication task with excursions to drivers DRV.In a situation involving one processor, the change induced in the time allocation of the communication task by the application program will relate mainly to the communication with external units such as the operator console or central computer. This is the part of the PLC cycle which is denoted by the reference DCP in Fig. 2a. When two processors are involved, notably the communication task COM/MBX, controlling the communication between the two processors, will be affected.Both in the case of one and in the case of two processors the exchange of data between the data communication task and the sequential control task takes place via a memory MBX which can beaddressed from both tasks. As is shown in the Figs. 2a and 2b, the writing and reading from the memory MBX in the sequence control task takes place during a part of the cycle executed during this task. During a cycle, a given amount of time is allocated to each task in the sequence control.Fig. 3 shows a flow chart of an application program for a programmable logic controller in accordance with the invention. The application program shown controls two phases of the operation of a machine or process. The first phase, indicated in section 30, is a time-critical phase, for example the filling and subsequent opening of the mould of an injection moulding machine. The second phase, denoted by the reference 40, is far less time-critical and in the case of an injection moulding machine it concerns, for example the removal of the workpiece and the closing of the mould. A further control task in whichtime-critical as well as less time-critical phases occur is the control of a numerically controlled milling machine or lathe.The phase during which a workpiece is actually being worked is substantially more time-critical than the displacement of tool or workpiece in free space or the exchange of a tool.The program is started by a command, for example from a user console, thus fetching the necessary control parameters which indicate how the action is to be performed. Subsequently, the program starts first in the time-critical phase. In accordance with the invention first (in block 32) the period available to data communication will be adjusted to a very small value, for example 2 ms.Subsequently, the time-critical phase is executed, during which successively: in block 41 the instantaneous state of the machine or the process is determined on the basis of the parameters entered during the input task of a PLC cycle; in block 42 the necessary corrections are calculated; in block 43 the necessary control signals are entered in the memory locations wherefrom they are applied to the actuators during the execution task of the PLC cycle; and finally in block 44 it is checked whether this first phase may be terminated. If not, this cycle within the user task is repeated; otherwise, the operation proceeds to the second phase. This phase consists of the same tasks, indicated by the blocks 51, 52, 53 and 54, respectively.However, this second phase 50 is preceded by a block 33 informing the firmware program that the data communication phase of a PLC cycle must be long, for example 10 or 20 ms. During this long phase large blocks of control parameters can be made available to the user task in one or only a few PLC cycles.。

自动化专业英语——Introductions to PLC

n.词首大写字母 6. internal adj.内在的，国内的
潜在的，可能的
n. 潜能，潜力，电压
8. pulse n.脉搏，脉冲
9. register n. 登记，注册，寄存器
vt. 登记，把...挂号
vi. 登记，注册
10. retentive adj. 保持的
vt. 转换，转变 18. temporary adj.暂时的 19. timer n.计时员，记时员 20. transistor n.[电子]晶体管
2020年7月1日8时59分
专业英语
3
21. triac <美> [电子]三端双向可控硅开关元件 22. via prep. 经，通过，经由
2020年7月1日8时59分
专业英语
5
PLC(可编程控制器)是为替代实现机器顺序控制所必须的继电器电路而发明的装置。
句中that引导的定语从句用来修饰主语a device，短语for machine control用来说明sequential relay circuits的作用。
2020年7月1日8时59分
2020年7月1日8时59分
专业英语
12
4. 常用的it结构的固定译法
It turned out that the good Lord had not led him astray.
后来证明，敬爱的上帝并没有使他迷途。
2020年7月1日8时59分
专业英语
13
Lesson 19 Introductions to PLC
New words and phrases :
1. circuit n.电路，一圈，周游 2. data storage n.数据保存，资料保存 3. dedicated adj.专注的，献身的 4. execute vt.执行，处死，制成使 5. initial adj. 最初的，词首的

PLC技术中英文翻译可编程控制器技术(英语原文中文翻译)

l 中文翻译可编程控制器技术随着时代的发展当今的技术也日趋完善、竞争愈演愈烈单靠人工的操作已不能满足于目前的制造业前景也无法保证更高质量的要求和高新技术企业的形象.人们在生产实践中看到自动化给人们带来了极大的便利和产品质量上的保证同时也减轻了人员的劳动强度减少了人员上的编制.在许多复杂的生产过程中难以实现的目标控制、整体优化、最佳决策等熟练的操作工、技术人员或专家、管理者却能够容易判断和操作可以获得满意的效果.人工智能的研究目标正是利用计算机来实现、模拟这些智能行为通过人脑与计算机协调工作以人机结合的模式为解决十分复杂的问题寻找最佳的途径我们在各种场合看到了继电器连接的控制，那已经是时代的过去，如今的继电器只能作为低端的基层控制模块或者简单的设备中使用到；而 PLC的出现也成为了划时代的主题，通过极其稳定的硬件穿插灵活的软件控制，使得自动化走向了新的高潮。

PLC的最大特点在于：电气工程师已不再电气的硬件上花费太多的心计，只要将按钮开关或感应器的输入点连接到 PLC的输入点上就能解决问题，通过输出点连接接触器或继电器来控制大功率的启动设备，而小功率的输出设备直接连接就可以。

PLC 的内部包含了具有中央处理器的CPU，并带有外部 I/O 口扩展的 I/O 接口地址和存储器三大块组成，CPU的核心是由一个或者多个累加器组成，它们具有逻辑的数学运算能力，并能读取程序存储器的内容通过计算后去驱动相应的存储器和 I/O 接口；I/O口将内部累加器和外部的输入和输出系统连接起来，并将相关的数据存入程序存储器或者数据存储器中；存储器可以将 I/O口输入的数据存入存储器中，并在工作时调转到累加器和 I/O接口上，存储器分程序存储器 lROM 和数据存储器 RAMROM可以将数据永久的存入存储器中，而 RAM 只能作为 CPU计算时临时计算使用的缓冲空间。

PLC的抗干扰是极其优秀的，我们根本不用去关心它的使用寿命和工作场合的恶劣，这些所有的问题已不再成为我们失败的主题，而留给我们的是关心如何来利用 PLC 的内部资源为我们加强设备的控制能力，使我们的设备更加的柔性。

PLC的介绍（英文）

PLC introducedThe graduation project topic is the application of PLC in the servo servo system, the PLC application and understanding of the graduate design, following the basic knowledge of PLC to make a brief introduction.The PLC can be programmed controller is the new industrial control devices based on computer technology. The PLC in the PLC draft standards issued by the International Electrotechnical Commission in 1987 made the following definition: "the PLC is a specially designed for applications in industrial environments digital computing operation of electronic devices which can be programmed memory, with to implementation of the logical, sequential operation, timing, counting and arithmetic operations, such as operating instructions in its internal storage and can be digital or analog inputs and outputs to control various types of machinery or production processes. PLC and its related peripherals should be easy and industrial control systems to form a whole, easy to extend the principle of functional design. "A.PLC features(a)High reliability, strong anti-jamming capabilityHigh reliability is the key to performance of the electrical control equipment.PLC is due to the introduction of modern LSI technology, strict production process, the internal circuit to take the advanced anti-jamming technology, with high reliability. For example, the Mitsubishi F series PLC MTBF up to 300,000 hours. Redundant CPU PLC, the average time between failures is longer. From a machine outside the circuit of the PLC, the PLC constitutes a control system, and compared to the same scale relay contactor system, electrical wiring and switch contacts have been reduced to hundreds or even thousands, the fault will be greatly reduced. In addition, PLC with a self-detection of hardware failure, failure to timely alert. In the application software, application can also be incorporated into the peripheral devices and fault diagnostic procedures, also received the fault self-diagnostic protection circuit outside the PLC system and equipment. In this way, the entire system with high reliability is also not surprising.Complete, fully functional, and applicability(b)Complete, fully functional, the applicabilityPLC development today, has formed a large, medium and small scale series products. Can be used for industrial control applications of all sizes. In addition to the logical processing functions, the modern PLC mostly data computing power can be used for a variety of digital control. In recent years the emergence of a large number of functional units of the PLC, PLC penetrated into the position control, temperature control, CNC and other industrial control. With PLC communication capability enhancement and development of human-computer interface technology, the use of PLC composed of a varietyof control systems have become very easy.(c)Easy to use, well received by engineers and technicians welcomePLC as a general-purpose industrial control computer, industrial control equipment for industrial and mining enterprises. It easy to interface, programming language is easy to be accepted for engineering and technical personnel. The ladder language graphic symbol and expression and relay circuit is very close, only a small number of switch PLC logic control instructions can easily relay circuit. Not familiar with the electronic circuit, people do not understand computer theory and assembly language using a computer to engage in industrial control to open the door.(d)System design, construction workload is small, easy to maintain, easy to transformPLC storage logic instead of wiring logic, greatly reduce the external wiring of control equipment, control system design and construction of the cycle is much shorter, while maintaining also become easily. More important is that the same device after the change the change the production process become possible. It is suitable for the occasion of many varieties, small batch production.(e)Small size, light weight, low energy consumptionUltra-Small PLC, for example, the newly produced species at the bottom of size less than 100mm, weighs less than 150g, only a few watts of power. Due to small size it is easy to load the internal machinery is the ideal control device for mechanical and electrical integration.B.The composition of the PLCPLC is divided into fixed and modular (modular) two points from the structure. Fixed PLC CPU board, I / O board, display panel, memory blocks, power, and these elements are combined into a non-removable as a whole. Modular PLC CPU module, I / O modules, memory, power supply modules, backplane or rack, these modules can be combined according to certain rules configuration.(a)The composition of the CPUCPU is the core of the PLC, since the role of the nerve center, at least one CPU in each PLC, the PLC system program, the functions entrusted to the reception and storage of user programs and data collected from field input devices sent a scanned stateor data, and deposit shall be required to register, at the same time, the diagnostic power and the working status of the PLC internal circuitry and programming process in syntax errors. Into operation from the user program memory, one by one read command, the corresponding control signal analysis and then according to the mandate of instruction, to command the control circuit.CPU is the main contact between the computing device, controller, register, and to implement them, control and status bus, a CPU unit also includes a peripheral chips, bus interface, and related circuit. Memory is mainly used for storing programs and data is an integral unit in PLC.User opinion, unnecessarily detailed analysis of the internal circuitry of the CPU, but on the part of the working mechanism should have sufficient understanding. The CPU controller controls the CPU to read instructions, which explain the instructions and execute instructions. However, the pace of work is controlled by the oscillation signal. The arithmetic unit is used for digital or logic operation under the command of the controller. Register to participate in operations, and store intermediate results of operations, it is under the command of the controller.CPU speed and memory capacity are important parameters in the PLC, they determine the pace of work of the PLC, IO number and software capacity, thus limiting the size of the control.(b)I / O modulesThe interface of the PLC and the electrical circuit is completed by the input and output portion (I / O). I / O modules with integrated PLC's I / O circuit, the input registers reflect the state of the input signal, output point to reflect the state of the output latch. The input module electrical signals into a digital signal into a PLC system, the output module is the opposite. I / O module is divided into the digital input (DI), digital output (DO), analog input (AI), analog output (AO).The I / O are classified as follows:Switch: the voltage level points, 220VAC, 110VAC, 24VDC, points by way of isolation and separation of relays and transistor isolation.Analog: Signal type, current-(4-20mA, 0-20mA), voltage type (0-10V,0-5V,-10-10V), etc., precision points, 12bit, 14bit, 16bit.In addition to these general-purpose IO, there are special IO module, such as thermal resistance, thermocouple, pulse module.I / O points to determine the module specification and quantity, I / O modules can be more or less, but the maximum number of the ability of the CPU can manage the basic configuration, that is, by the largest number of floor or rack slot limit.(c)Power supply modulePLC power supply IC for the PLC module supplies power to operate. At the same time, some of the input circuit to provide 24V power supply. Power input type: AC power (220VAC or 110VAC), DC power supply (usually24VDC).C. Working principlePut into operation when the programmable logic controller, the course of their work is generally divided into three stages, that is, the input sample, the user program execution and output refresh three stages. Completion of the three stages is called a scan cycle. During the entire operation, the CPU of the programmable logic controller scan speed, repeat the above three stages. (a)Input sampling phaseThe input sampling stage, the programmable logic controller in order toscan read into the state of all input and data, and deposit them with the corresponding unit in the I / O image area. Transferred to the user program execution and output refresh period after the end of the input samp le. In both phases, even if the input state and data changes, the state and data of the corresponding unit in the I / O image area will not change. Therefore, if the input pulse signal, the signal of the pulse width must be greater than one scan cycle, in order to ensure that in any case, the input can be read into the.(b)User program execution stageIn the user program execution stage, programmable logic controllers are always followed by a top-down order to scan the user program (ladder). Scan each one ladder, and always scan by the contact of the ladder left of the control of line, and first left and right first and then the order of logical operations on the control circuit by the contact form , then the logical result of the operation, refresh the logic of the coil system RAM storage area corresponding state; or refresh the state of the output coil corresponding bits in the I / O image area; or determine whether to perform the ladder the provisions of the special function instruction.That is, during user program execution, only the input status and data points in the I / O image area does not change, the output point and soft devices in the I / O image area or system RAM storage areastatus and data are likely to change, but came in above the ladder program execution results will be ranked below those who used these coils or data ladder work; the contrary, the row below the ladder, thethe status of logic coils to be refreshed or the data can only be to the next scan cycle can be ranked on top of the program work.If you use the I / O instruction immediately you can directly access the I / O points in the process of program execution. That the use of I / O instruction, the input process image register values are not updated, the program directly from the I / O module value, the output process image register is immediately updated, this immediately enter some difference.(c)Output refresh periodWhen the scan the user program after the end of the programmable logic controller to enter the output refresh period. During this time, the CPU in accordance with the I / O image area corresponding to the state and data refresh all of the output latch circuit driven by the output circuit corresponding peripherals. At this time, is the real output of the programmable logic controller.D.PLC applicationsAt present, the PLC at home and abroad has been widely used in iron and steel, petroleum, chemicals, electricity, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection and cultural entertainment industry, usage can be broadly divided into the following categories.(a)Switch logic controlThis is the PLC basic, wide range of applications, which replaces thetraditional relay circuit, logic control, sequential control, both for the control of a single device, can also be used for multi-group control and automated assembly line.Such as injection molding machines, printing presses, stapler machine, combined machine tools, grinding machines, packaging production lines, electroplating lines and so on.(b)Analog ControlIn the industrial production process, there are many continuous variables, such as temperature, pressure, flow, level and speed are analog. To make the programmable controller to handle analog, analog (Analog) and Digital (Digital) A / D conversion and D / A conversion. PLC manufacturers are supporting the production of A / D and D / A converter module, the programmable controller for analog control.(c)Motion ControlPLC can be used in a circular motion or linear motion control.From the configuration of the control mechanism, early used directly in the switch I / O modules to connect the position sensors and actuators, is now generally use a dedicated motion control module. Drive a single or multi-axis position of the stepper motor or servo motor control module. The world on all major PLC manufacturers products almost every motion control functions, widely used in a variety of machinery, machine tools, robots, elevators and other occasions. (d)Process controlProcess control refers to the closed-loop control of temperature, pressure, flow analog. As an industrial control computer, the PLC can prepare a variety of control algorithm, the complete closed-loop control. PID regulation is a general closed-loop control system using more regulation. And medium-sized PLC have PID modules, and many small PLC also has this feature module. PID processing is generally run a dedicated PID subroutine. Process control in metallurgy, chemical industry, heat treatment, boiler control and so on a very wide range of applications.(e)Data processingModern PLC math (including matrix operations, functions, operation, logic operation), data transfer, data conversion, sorting, look-up table, bit operation functions, you can complete the data collection, analysis and processing.These data can be compared with the reference value stored in memory to complete the control operation can also use the communication functions to other intelligent devices, or print them tabulation. The data processing is generally used for large-scale control systems, flexible manufacturing systems such as unmanned control; can be used for process control systems, such as papermaking, metallurgy, food industry, some large-scale control system.(f)Communications and networkingPLC communication with the communication between PLC and communication between the PLC and other intelligent devices.With the development of computer control, factory automation, network development,the PLC manufacturers have attached great importance to the PLC communication function, have launched their own network systems. The newly produced PLC communication interface, communication is very convenient. E. History of the development(a)OriginGeneral Motors in 1968 to replace the relay control device requirements;In 1969, Digital Equipment Corporation developed the first programmable logic controller PDP-14, successful trial in the U.S. GM's production line, using procedural means for the first time used in electrical control, which is the first generationprogrammable logic controllers, said Programmable, is recognized as the world's first PLC.In 1969, the United States developed the world's first PDP-14;In 1971, Japan developed the first DCS-8;In 1973, Germany developed the first PLC;In 1974, the Chinese developed the first PLC.(b)DevelopingThe microprocessor in the early 1970s. Will soon be introduced into the programmable logic controller, programmable logic controller to increase the computing, data transmission and processing and other functions, the real computer features of industrial control devices. Programmable logic controller is the product of combining conventional control concepts of computer technology and relay. Development of personal computers, in order to facilitate and reflect the features of the programmable controller, programmable logic controllers be called the Programmable Logic Controller (PLC).The late 1970s, the programmable logic controller into the practical stage of development, computer technology has the full introduction of the programmable controller, a leap to make it function. Higher operating speed, ultra-compact size, the more reliable industrial anti-jamming design, analog computing, the PID function and the high cost laid in modern industry.The early 1980s, the programmable logic controller has been widely used in the advanced industrial countries. Production of programmable controllers on the country in the world is increasing, production is rising. This indicates that the programmable controller has entered a mature stage.1980s to the mid-1990s, the fastest-growing period of the programmable logic controller, the annual growth rate has been maintained at 30 to 40 percent. During this period, the PLC in the processing capacity of analog, digital computing power, man-machine interface capabilities and network capabilities have been greatly improved, programmable logic controllers gradually into the field of process control in the field of process control is replaced in some applications dominance of the DCS system.The late 20th century, the development characteristics of the programmable logic controller is more responsive to the needs of modern industry. This period the development of mainframes and super-minicomputer,the birth of a variety of special function units, the production of a variety of man-machine interface unit, communication unit, so that the application of programmable logic controllers, industrial control equipment supporting easier.。

PLC的英文介绍

PLC IntroductionProgrammable controller is the first in the late 1960s in the United States, then called Plc programmable logic controller (Programmable Logic Controller) is used to replace relays. For the implementation of the logical judgment, timing, sequence number, and other control functions. The concept is presented Plc General Motors Corporation. Plc and the basic design is the computer functional improvements, flexible, generic and other advantages and relay control system simple and easy to operate, such as the advantages of cheap prices combined controller hardware is standard and overall. According to the practical application of target software in order to control the content of the user procedures memory controller, the controller and connecting the accused convenient target.In the mid-1970s, the Plc has been widely used as a central processing unit microprocessor, import export module and the external circuits are used, large-scale integrated circuits even when the Plc is no longer the only logical (IC) judgment functions also have data processing, PID conditioning and data communications functions. International Electro technical Commission (IEC) standards promulgated programmable controller for programmable controller draft made the following definition : programmable controller is a digital electronic computers operating system, specifically for applications in the industrial design environment. It used programmable memory, used to implement logic in their internal storage operations, sequence control, timing, counting and arithmetic operations, such as operating instructions, and through digital and analog input and output, the control of various types of machinery or production processes. Programmable controller and related peripherals, and industrial control systems easily linked to form a whole, to expand its functional design. Programmable controller for the user, is a non-contact equipment, the procedures can be changed to change production processes. The programmable controller has become a powerful tool for factory automation, widely popular replication. Programmable controller is user-oriented industries dedicated control computer, with many distinctive features.First, high reliability, anti-interference capability;Second，programming visual, simple;Third, adaptability good;Fourth functional improvements, strong functional interface1.Design Theory DevelopmentToday, the primary focus of most design research is based on mechanical or electrical products. One of the by-products of this proposed research is to enhance our fundamental understanding of design theory and methodology by extending it to the field of engineering systems design.A system design theory for large-scale and complex system is not yet fully developed. Particularly, the question of how to simplify a complicated or complex design task has not been tackled in a scientific way. Furthermore, building a bridge between design theory and the latest epistemological outcomes of formal representations in computer sciences and operations research, such as discrete event system modeling, can advance future development in engineering design.2.Application in Logical Hardware DesignFrom a logical perspective, PLC software design is similar to the hardware design of integrated circuits. Modern VLSI designs are extremely complex with several million parts and a product development time of 3 years [Whitney, 1996]. The design process is normally separated into a component design and a system design stage. At component design stage, single functions are designed and verified. At system design stage, components are aggregated and the whole system behavior and functionality is tested through simulation. In general, a complete verification is impossible. Hence, a systematic approach as exemplified for the PLC program design may impact the logical hardware design.Programming languagesHigher level PLC programming languages have been around for some time, but lately their popularity has been mushrooming. As Raymond Lavelle, vice president and general manager, Siemens Energy and Automation. Inc, Programmable Controls Division, points out :”As programmable controls are being used for more and more sophisticated operations, languages other than ladder logic become more practical, efficient, and powerful. For example, it's very difficult to write a trigonometric function using ladder logic. ”Languages gaining acceptance include Boolean, control system flowcharting, and such function chart languages as Graphtec and its variations. And these’s incre asing interest in languages like C and BASIC.PLCs in process controlThus far, PLCs have not been used extensively for continuous process control. Will this continue? ”The feeling that I’ve gotten,” says Ken Jeannette, manager, product planning, Series One and Series Six products, at GE Frame North America, "is that PLCs will be used in the process industry but not necessarily for process control.”Several vendors-obviously betting that the opposite will happen-have introduced PLCs optimized for process applications. Rich Ryan ,manager, commercial marketing, Allen-Bradley Programmable Controls Div, cites PLCs’ increasing use in such industries as food, chemicals, and petroleum. Ryan feel there are two types of applications in which they’re appropriate.”One, "he says, "is where the size of the process control system that's being automated doesn’t justify DCS[distributed control systems].With the starting price tags of those products being relatively high, a programmable controller makes sense for small, low loop count applications. The seconds where you have to integrate the loop closely with the sequential logic. Batch controller sere prime examples, where the sequence and maintaining the process variable are intertwined so closely that the benefits of having a programmable controller to do the sequential logic outweighs some of the disadvantages of not having a distributed control system.”Bill Barkovtz, president of Triconex, predicts that "all future controllers that come out in the process control system business will embrace a lot more PLC technology and a lot more PLC functionality than they ever did before.”Communications and MAPCommunications are vital to an individual automation cell and to the automated factory as a whole. We've heard a lot about MAP in the last few years, and a lot of companies have jumped on the band wagon. Many, however were disappointed when a fully-defined and completed MAP specification didn’t appear immediately. Says Larry Kumara:”Right now , MAP is still a moving target for the manufacturers specification that is not final. Presently, for example, people are introducing products to meet the MAP 2.1standard.Yet 2.1-based products will be obsolete when the new standard for MAP,3.0is introduced.”Because of this, many PLC vendors are holding off on full MAP implementations. Omron, for example , has an ongoing MAP-compatibilityprogram, but Frank Newborn, vice president of Omron’s Industrial Division, reports that because of the lack of a firm definition, Omron's PLCs don't yet talk to MAP.Since it’s unlikely that an individual PLC would talk to broadband MAP anyway, makers are concentrating n proprietary networks. According to Sal Provanzano, users fear that if they do get on board and vendors withdraw from MAP, they ‘ll pulse width modulation control system be the ones left holding a communications structure that’s not supported.。

介绍plc英语作文

介绍plc英语作文Introduction to PLC。

Programmable Logic Controller (PLC) is a digital computer used in automation systems for controlling industrial processes and machinery. It is a device that can be programmed to perform a set of instructions to control a machine or process. The PLC system is widely used in industries such as manufacturing, food processing, and oil and gas.PLC Basics。

A PLC consists of a central processing unit (CPU), input/output (I/O) modules, and a programming device. The CPU is the brain of the PLC and executes the program instructions. The I/O modules are used to interface the PLC with the external world, such as sensors, actuators, and other devices. The programming device is used to write and edit the program instructions.PLC Programming。

PLC programming is done using a programming language called ladder logic. Ladder logic is a graphical language that uses symbols to represent different functions and operations. The ladder logic program is created using a programming software, which is then downloaded into the PLC memory.PLC Applications。

PLC基础知识简介外文文献翻译、中英文翻译、外文翻译

附录：外文资料译文PLC elementary knowledge synopsisIn the automated control domain, PLC is one kind of important control device. At present, in the world has more than 200 factories to produce more than 300 varieties PLC product, applies in the automobile (23%), the grain processing (16.4%), chemistry/drugs manufacture (14.6%), the metal/mine (11.5%), the paper pulp/papermaking (11.3%) and so on the profession. In order to make fellow beginners conveniently to understand PLC, this article to the PLC development, the basic structure, the disposition, using and so on the elementary knowledge makes a synopsis.First, PLC development courseIn the industrial production process, the massive switches quantity sequential control, it carries on the smooth movement according to the logical condition, and defers to the logical relations to carry on the chain-like protection movement the control, and massive data acquisition. In the tradition, these functions are realize through air operated or the electricity control system. In 1968 American GM (general automobile) the company proposed the substitution continues the electricity control device the request, the second year, the American numeral company developed based on the integrated circuit and the electronic technology control device, used sequenced the method to apply for the first time to the electrical control, this was the first generation of programmable foreword controller, calledProgrammable Controller (PC).After the personal computer (is called PC) to develop, in order to be convenient, also in order to reflect the programmable controller the function characteristic, the programmable foreword controller chooses a name is Programmable Logic Controller (PLC), now, still frequently was called PLC PC.The PLC definition has many kinds. The international electrician committee (IEC) to PLC the definition is: The programmable controller is one kind of digital operation operation electronic system, specially for applies under the industry environment designs. It uses the programmable foreword the memory, uses for to carry out the logic operation, the sequential control in its internal storage, fixed time, counts with operation the and so on arithmetic operation instruction, and through digital, the simulation input and the output, controls each kind of type the machinery or the production process. The programmable foreword controller and its the related equipment, all should according to easy form a whole with the industry control system, is easy to expand its function the principle design.On the century 80's to the 90's intermediate stages, are PLC develop the quickest time, the yearly rate continuously maintenance are 30-40%. In this time, PLC in the processing simulation quantity ability, the digital operation ability, the man-machine connection ability and the networking capability obtains the large scale enhancement, PLC gradually enters the process control domain, substituted in certain applications has been at the dominant position in the process control domain the DCS system.PLC has the versatility strongly, the easy to operate,the adaption surface broad, the reliability high, the antijamming ability strong, the programming is simple and so on the characteristic. PLC in the industrial automation control specially is in the sequential control status, in future which may foresee, is unable to substitute.Second, PLC constitutionFrom the structure the minute, PLC divides into the stationary type and the combined type (module type) two kinds. Stationary PLC including the CPU board, the I/O board, demonstrated the kneading board, the memory block, the power source and so on, these element groups synthesize a not dismantable whole. Module type PLC including the CPU module, the I/O module, the memory, the power source module, the ledger wall or the rack, these modules may defer to the certain rule combination disposition. Second, PLC constitution.Third, CPU constitutionCPU is the PLC core, plays nerve center's role, every time wraps PLC at least to have CPU, it function receive and storage user program and data which entrusts with according to the PLC system program, with scanning way gathering the condition or the data which sends by the scene input device, and stores the stipulation in the register, simultaneously, diagnoses the power source and in the PLC internal circuit active status and the programming process grammatical error and so on. After enters the movement, reads from the user program memory by the strip takes the instruction, the duty which stipulated according to the instruction produces the corresponding control signal again after the analysis, directs the related control circuit.CPU mainly by the logic unit, the controller, theregister and realizes the data, the control and the condition main line constitution which between them relates, the CPU unit also includes the periphery chip, the main line connection and the related electric circuit. The memory mainly uses in the stored routine and the data, is the PLC essential composition unit.Looked like in the user, nonessential multianalysis CPU internal circuit, but or should have the enough understanding to each part of work mechanism. The CPU controller controls the CPU work, reads by it takes the instruction, the interpretive order and carries out the instruction. But the work rhythm by shakes the signal control. The logic unit uses in to carry on the numeral or the logic operation, works under the controller direction. The register participation operation, coexists stores the operation the intermediate result, it also is works under the controller direction.The CPU speed and the memory capacity are the PLC important parameter, they are deciding the PLC working speed, the IO quantity and the software capacity and so on, therefore is limiting the control scale.Fourth, I/O modulePLC and the electrical return route connection, is (I/O) completes through the input output unit. The I/O module integrated the PLC I/O electric circuit, its input temporary storage device reflection input signal condition, output point reflection output latch condition. The load module transforms the electrical signal the digital signal to enter the PLC system, the output module is opposite. I/O divides into the switch quantity input (DI), switch quantity output (DO), simulation quantity input (AI), simulation quantity output (AO) and so on module.The switch quantity is refers has and closes (or 1 and 0) two kind of conditions signals, the simulation quantity is only a quantity which refers continuously changes. Commonly used I/O classifies as follows:Switch quantity: Divides equally according to the voltage water, has 220VAC, 110VAC, 24VDC, divides according to the isolation way, has the relay isolation and the transistor isolation.Simulation quantity: Divides according to the signal type, has the electric current (4-20mA,0-20mA), the voltage (0-10V,0-5V, -10-10V) and so on, divides according to the precision, has 12bit,14bit,16bit and so on.Besides above general I/O, but also has the special I/O module, like module and so on thermal resistance, thermo-element, pulse.According to the I/O points determination module specification and the quantity, the I/O module may be many may be few, but its biggest number the basic disposition ability which can manage CPU, namely biggest ledger wall or rack Key slot number limit.Fifth, power source moduleThe PLC power source uses in is the PLC various modules integrated circuit provides the work power source. At the same time, some also provides 24V for the input circuit the work power source. The mains input type includes: (What the alternating current supply (220VAC or 110VAC), the direct-current power supply is commonly used is 24VAC).Sixth, PLC system other equipment1st, programs the equipment: The programming is the PLC development application, the monitor movement, the inspection maintains the essential component, uses in toprogram, makes some hypotheses to the system, monitors the system working condition which PLC and PLC controls, but it not directly participates in the scene control movement. Small programming PLC generally has the grasping programming, at present generally (movement programming software) acts as the programming by the computer.2nd, man-machine contact surface: The simplest man-machine contact surface is the indicating lamp and the button, at present the liquid crystal screen (or touches screen) a formula writing style operator terminal application to be more and more widespread, (movement configuration software) acts as the man-machine contact surface by the computer extremely to popularize.3rd, input-output device: Uses in permanently the memory user data, like EPROM, EEPROM reading in, bar code microreader, input simulation quantity potentiometer, printer and so on.PLC基础知识简介在自动化控制领域，PLC是一种重要的控制设备。

数控技术专业英语(第2版)：Unit 5 Introduction to PLC

它们被用于高速数据处理、高速数据通信、高级计算(PLC) 机语言支持，当然也用于基本过程控制。 “of course”为插入语，起附加说明的作用，即相当于 “and they are used for basic process control.”
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Programmable logic controllers (PLCs) were first introduced in 1968 as a substitute for hardwired relay panels. The original intent was to replace a mechanical switching device (relay modules). However, since 1968, the capabilities of the PLCs were to replace relay panels, modern PLCs have many more functions. Their use extends from simple process control to manufacturing system controls and monitoring.
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Fig.5-1
Fig.5－1 Application of PLC( Controls Step/Servo Motor) 返回
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PLCs vary in size and power. A large PLC can have up to 10000 I/O points and support all the functions discussed earlier. There are also expansion slots to accommodate PC and other communication devices. For many applications, a small PLC is sufficient. Fig.5-2 shows a small PLC. It has 16 I/O points and a standard RS-232 serial communication port. The speed of PLC is constantly improving, even the low-end PLCs perform at high speed. One to two microsec / kbyte of memory speed is very common.

plc工程师英语口语

作为一名PLC工程师，英语口语对于与国际客户和团队进行沟通非常重要。

以下是一些常用的英语口语表达，可以帮助你在工作中更加流利地交流：1. Introduction and Greetings（介绍和问候）- "Hello, I'm [Your Name], a PLC engineer."- "Nice to meet you. I specialize in PLC programming and automation."- "How are you today? Is there anything specific you'd like to discuss?"2. Requesting Information（请求信息）- "Could you please provide me with the specifications for this project?"- "I need some more details regarding the inputs and outputs of the PLC."- "Can you clarify the requirements for the ladder logic programming?"3. Describing PLC Functionality（描述PLC功能）- "The PLC is responsible for controlling the operation of the machinery."- "Our PLC system uses ladder logic programming to monitor inputs and control outputs." - "The PLC communicates with various sensors and actuators to perform automated tasks."4. Troubleshooting and Problem-solving（故障排除和解决问题）- "There seems to be an issue with the communication between the PLC and the HMI."- "Let's analyze the error log to identify the root cause of the problem."- "We might need to update the firmware of the PLC to resolve this issue."5. Discussing Project Progress（讨论项目进展）- "The hardware installation is complete, and we are now working on the software development."- "We have successfully tested the PLC program in the simulation environment."- "We are on track to meet the project deadline and deliver the final product."6. Making Suggestions and Recommendations（提出建议和推荐）- "I suggest implementing redundancy in the PLC system to ensure high availability."- "It would be beneficial to conduct regular maintenance and calibration of the PLC components."- "Considering the complexity of the project, I recommend involving an experienced PLC programmer."记住，口语交流需要练习和自信。

中英文文献翻译-PLC控制器的简介

英文原文Introduction To PLC ControllersAlong with the development of the ages, the technique that is nowadays is also gradually perfect, the competition plays more strong; the operation that list depends the artificial has already can't satisfied with the current manufacturing industry foreground, also can't guarantee the request of the higher quantity and high new the image of the technique business enterprise.The people see in produce practice, automate brought the tremendous convenience and the product quantities for people up of assurance, also eased the personnel's labor strength, reduce the establishment on the personnel. The target control of the hard realization in many complicated production lines, whole and excellent turn, the best decision etc., well-trained operation work, technical personnel or expert, governor but can judge and operate easily, can acquire the satisfied result. The research target of the artificial intelligence makes use of the calculator exactly to carry out, imitate these intelligences behavior, moderating the work through person's brain and calculators, with the mode that person's machine combine, for resolve the very complicated problem to look for the best pathWe come in sight of the control that links after the electric appliances in various situation, that is already the that time generation past, now of after use in the mold a perhaps simple equipments of grass-roots control that the electric appliances can do for the low level only; And the PLC emergence also became the epoch-making topic, adding the vivid software control through a very and stable hardware, making the automation head for the new high tide.The PLC biggest characteristics lie in: The electrical engineering teacher already no longer electric hardware up too many calculations of cost, as long as order the importation that the button switch or the importation of the sensors order to link the PLC up can solve problem, pass to output to order the conjunction contact machine or control the start equipments of the big power after the electric appliances, but the exportation equipments direct conjunction of the small power can.PLC internal containment have the CPU of the CPU, and take to have an I/ O for expand of exterior to connect a people's address and saving machine three big pieces to constitute, CPU core is from an or many is tired to add the machine to constitute, mathematics that they have the logic operation ability, and can read the procedure save the contents of the machine to drive the homologous saving machine and I/ Os to connect after pass the calculation; The I/ O add inner part is tired the input and output system of the machine and exterior link, and deposit the related data into the procedure saving machine or data saving machine; The saving machine can deposit the data that the I/ O input in the saving machine, and in work adjusting to become tired to add the machine and I/ Os to connect, saving machine separately saving machine RAM of the procedure saving machine ROM and dates, the ROM can do deposit of the data permanence in the saving machine, but RAM only for the CPU computes the temporary calculation usage of hour of bufferspace.The PLC anti- interference is very and excellent, our root need not concern its service life and the work situation bad, these all problems have already no longer become the topic that we fail, but stay to our is a concern to come to internal resources of make use of the PLC to strengthen the control ability of the equipments for us, make our equipments more gentle.PLC language is not we imagine of edit collected materials the language or language of Cs to carry on weaving the distance, but the trapezoid diagram that the adoption is original after the electric appliances to control, make the electrical engineering teacher while weaving to write the procedure very easy comprehended the PLC language, and a lot of non- electricity professional also very quickly know and go deep into to the PLC.PLC is one of the advantage above and only, this is also one part that the people comprehend more and easily, in a lot of equipments, the people have already no longer hoped to see too many control buttons, they damage not only and easily and produce the artificial error easiest, small is not a main error perhaps you can still accept; But lead even is a fatal error greatly is what we can't is tolerant of. New technique always for bringing more safe and convenient operation for us, make we a lot of problems for face on sweep but light, do you understand the HMI? Says the HMI here you basically not clear what it is, also have no interest understanding, change one inside text explains it into the touch to hold or man-machine interface you knew, and it combines with the PLC to our larger space.HMI the control not only is reduced the control press button, increase the vivid of the control, more main of it is can sequence of, and at can the change data input to output the feedback with data, control in the temperature curve of imitate but also can keep the manifestation of view to come out. And can write the function help procedure through a plait to provide the help of various what lies in one's power, the one who make operate reduces the otiose error. Currently the HMI factory is also more and more, the function is also more and more strong, the price is also more and more low, and the noodles of the usage are wide more and more. The HMI foreground can say that think ° to be good very.The PLC correspondence has already come more body now its value, at the PLC and correspondence between PLCs, can pass the communication of the information and the share of the dates to guarantee that of the equipments moderates mutually, the result that arrive already to repair with each other. Data conversion the adoption RS232 between PLC connect to come to the transmission data, but the RS232 pick up a people and can guarantee 10 meters only of deliver the distance, if in the distance of 1000 meters we can pass the RS485 to carry on the correspondence, the longer distance can pass the MODEL only to carry on deliver.The PLC data transmission is just to be called a form to it in a piece of and continuous address that the data of the inner part delivers the other party, we, the PLC of the other party passes to read data in the watch to carry on the operation. If the data that data in the watch is a toestablish generally, that is just the general data transmission, for example today of oil price rise, I want to deliver the price of the oil price to lose the oil ally on board, that is the share of the data; But take data in the watch for an instruction procedure that controls the PLC, that had the difficulty very much, for example you have to control one pedestal robot to press the action work that you imagine, you will draw up for it the form that a procedure combine with the data sends out to pass by.A line of transmission of the information contains a string of and combine the cent of: The usual PLC is 8 machines, certainly also having 16 machines. We can be an at the time of sending out the data a send out to the other party, also can be 88 send out the data to the other party, an and 8 differentiations are also the as that we say to send out the data and combine sends out the data. A speed is more and slowly, but as long as 2 or three lines can solve problem, and can use the telephone line to carry on the long range control. But combine the ocular transmission speed is very quick of, it is a string of ocular of 25600%, occupy the advantage in the short distance, the in view of the fact TTL electricity is even, being limited by the scope of one meter generally, it combine unwell used for the data transmission of the long pull, thus the cost is too expensive.When you are reading the book, you hear someone knock on door, you stop to start up of affair, open the door and combine to continue with the one who knock on door a dialogue, the telephone of this time rang, you signal hint to connect a telephone, after connecting the telephone through, return overdo come together knock on door to have a conversation, after dialogue complete, you continue again to see your book, this kind of circumstance we are called the interruption to it, it has the authority, also having sex of have the initiative, the PLC had such function .Its characteristics lie in us and may meet the urgently abrupt affairs in the operation process of the equipments, we want to stop to start immediately up of work, the whereabouts manages the more important affair, this kind of circumstance is we usually meet of, PLC while carry out urgent mission, total will keep the current appearance first, for example the address of the procedure, CPU of tired add the machine data etc., be like to stick down which the book that we see is when we open the door the page or simply make a mark, because we treat and would still need to continue immediately after book of see the behind. The CPU always does the affair that should do according to our will, but your mistake of give it an affair, it also would be same to do, this we must notice.The interruption is not only a, sometimes existing jointly with the hour several inside break, break off to have the preferred Class, they will carry out the interruption of the higher Class according to person's request. This kind of breaks off the medium interruption to also became to break off the set. The Class that certainly break off is relevant according to various resources of CPU with internal PLC, also following a heap of capacity size of also relevant fasten.When we are work a work piece, giving the PLC a signal, counting PLC inner part the machine add 1 to compute us for a day of workload, a count the machine and can solve problem inbrief, certainly they also can keep the data under the condition of dropping the electricity, urging the data not to throw to lose, this is also what we hope earnestly.The PLC still has the function that the high class counts the machine, being us while accept some dates of high speed, the high speed that here say is the data of the in all aspects tiny second class, for example the bar code scanner is scanning the data continuously, calculating high-speed signal of the data processor DSP etc., we will adopt the high class to count the machine to help we carry on count. It at the PLC carries out the procedure once discover that the high class counts the machine to should of interruption, will let go of the work on the hand immediately. The trapezoid diagram procedure that passes by to weave the distance again explains the high class for us to carry out procedure to count machine would automatic performance to should of work, thus rise the Class that the high class counts the machine to high one Class.You heard too many this phrases perhaps:" crash", the meaning that is mostly is a workload of CPU to lead greatly, the internal resources shortage etc. the circumstance can't result in procedure circulate. The PLC also has the similar circumstance, there is a watchdog WDT in the inner part of PLC, we can establish time that a procedure of WDT circulate, being to appear the procedure to jump to turn the mistake in the procedure movement process or the procedure is busy, movement time of the procedure exceeds WDT constitution time, the CPU turn but the WDT reset the appearance. The procedure restarts the movement, but will not carry on the breakage to the interruption.The PLC development has already entered for network ages of correspondence from the mode of the one, and together other works control the net plank and I/ O card planks to carry on the share easily. A state software can pass all se hardwires link, more animation picture of keep the view to carries on the control, and cans pass the Internet to carry on the control in the foreign land, the blast-off that is like the absolute being boat No.5 is to adopt this kind of way to make airship go up the sky.The development of the higher layer needs our continuous effort to obtain. The PLC emergence has already affected a few persons fully, we also obtained more knowledge and precepts from the top one experience of the generation, coming to the continuous development PLC technique, push it toward higher wave tide中文译文PLC控制器的简介随着时代的发展,当今的技术也日趋完善、竞争愈演愈烈;单靠人工的操作已不能满足于目前的制造业前景,也无法保证更高质量的要求和高新技术企业的形象.人们在生产实践中看到,自动化给人们带来了极大的便利和产品质量上的保证,同时也减轻了人员的劳动强度,减少了人员上的编制.在许多复杂的生产过程中难以实现的目标控制、整体优化、最佳决策等,熟练的操作工、技术人员或专家、管理者却能够容易判断和操作,可以获得满意的效果.人工智能的研究目标正是利用计算机来实现、模拟这些智能行为,通过人脑与计算机协调工作,以人机结合的模式,为解决十分复杂的问题寻找最佳的途径我们在各种场合看到了继电器连接的控制，那已经是时代的过去，如今的继电器只能作为低端的基层控制模块或者简单的设备中使用到；而PLC的出现也成为了划时代的主题，通过极其稳定的硬件穿插灵活的软件控制，使得自动化走向了新的高潮。

PLC的英文作文

PLC的英文作文PLC, which stands for Programmable Logic Controller, is a type of industrial digital computer that has been designed for controlling manufacturing processes, such as assembly lines, robotic devices, or any activity that requires high reliability control and ease of programming. It uses a programmable memory to store instructions and specific functions such as logic, sequencing, timing, counting, and arithmetic to control machines and processes.PLCs are widely used in many industries, including automotive, food processing, pharmaceutical, and energy. They are known for their rugged construction and resistance to temperature, humidity, and vibration, making them suitable for use in harsh industrial environments.The programming of a PLC is done using a specialized computer language, typically a variation of ladder logic, which is a graphical programming language that resembles a circuit diagram. This allows for easy understanding andmodification of the control logic, even for those without a deep understanding of traditional programming languages.One of the key advantages of PLCs is their flexibility and ease of reprogramming. This allows for quick changes in the control logic without the need to rewire the entire system, saving time and cost in the event of process changes or upgrades.In conclusion, PLCs play a crucial role in modern industrial automation, providing reliable and flexible control solutions for a wide range of manufacturing processes. Their ease of programming, rugged construction, and flexibility make them an essential tool in the field of industrial control and automation.。

外文翻译(英)PLC Introduction

PLC Introduction1 PLC characteristicsPLC is a dedicated user-oriented industrial control computer, has many distinctive features.1. High reliability, strong anti-interference abilityIn order to limit the occurrence of fault or failure, can quickly identify faults happen, the fault will be limited to the part of the production of various PC hardware and software vendors to adopt a variety of measures to enable the PC itself, apart from a strong Self-diagnostic capabilities, give wrong information in time to stop running to wait for repair, but also enable the PC has a strong anti-interference ability.2. High universality, variable control procedures, user-friendlyPLC range of a variety of hardware devices, can be composed to meet the requirements of the control system, the user does not have its own re-design and production of hardware devices. Users to determine hardware, the change in the production process or production equipment, the need not to change the PLC hardware device, simply adapted to meet the requirements of the procedure. Thus, PLC used in addition to stand-alone control, in factory automation has been widely adopted.3. Powerful and adapt a wide rangeModern PLC has not only logic operations, timing, counting, sequence control function, also has digital and analog input and output, power-driven, communications, human-computer dialogue, self-test, records show functions. Units one can control the production of machinery,a production line, can control a production process.4. Programmatically simple, easy to graspAt present, the majority of PLC is still being adopted in the form of relay control "programmatically ladder." Not only inherited the tradition of clear and intuitive control lines, but also taking into account the majority of factories and enterprises in the electrical technicians读图habits and programming level, so very easy to accept and master. PLC ladder in the implementation of procedures, with explanation of procedure will translate it into assembly language and then implement (PLC internal expanded to explain the procedure). Assembly language and direct the implementation of procedures for the preparation of the user compared to the implementation of ladder program longer, but for the majority of mechanical and electrical control equipment is negligible, fully meet the control requirements.5. A reduction of control system design and construction of the workloadBecause of PLC software used to replace the relay control system between a large number of relays, time relays, counters and other devices, the design and installation of control cabinet wiring workload greatly reduced. At the same time, PLC's user program can be simulated in thelaboratory testing, but also reduces the workload at the scene of debugging. In addition, PLC because of the low failure rate and a strong monitoring function, modular and so on, so that repair is also very convenient.6. Small ize, light weight, low ower consumption, easy maintenancePLC is to micro-electronics technology applied to industrial equipment products, its structure is compact, rugged, small size, light weight, low power consumption. And PLC because of the strong anti-interference ability, easy to load device is to achieve the ideal of mechatronics control equipment.2 PLC function and applicationProgrammable controller at home and abroad, is widely used in iron and steel, petrochemical, machinery manufacturing, automobile assembly, power, textile, electronics and information industry as well as other trades. At present, a typical PLC functions have the following points.Sequential Control: This is the most widely used programmable logic controller of the field, replacing the traditional sequential control relays, such as injection molding machines, printing machinery, Protocol machinery, paper cutter, combination of machine tools, grinders, assembly production lines, packaging production line , plating lines and elevator control.Program: In the industrial production process, much has changed for the volume, such as temperature, pressure, flow, liquid, speed, current and voltage and so on, known as analog. Programmable controllers have A / D and D / A converter module, so that the programmable controller can be used for analog control for the program.Data processing: general programmable controller has four computing instructions, can be easily produced in the process of data treatment. With PLC can constitute a monitoring system for data acquisition and processing, control the production process. Higher end of the programmable controller are position control module, used to control stepper motors, the implementation of various mechanical position control. Communication networking: Some control systems required to link up many PLC Units or by the use of a computer with multiple components distributed PLC control system. Programmable controller communication module to meet the networking requirements of these communications. Show print: programmable logic controller can also be connected display terminals and peripheral equipment such as printing, display and printing in order to achieve function.3 PLC ConnectionsWhen a process is controlled by a PLC it uses inputs from sensors to make deci-sions and update outputs to drive actuators, as shown in Figure 2.9. The process is a real process that will change over time. Actuatorswill drive the system to new states (or modes of operation). This means that the controller is limited by the sensors available, if an input is not available, the controller will have no way to detect a condition.Figure 2.9 The Separation of Controller and ProcessThe control loop is a continuous cycle of the PLC reading inputs, solving the lad-der logic, and then changing the outputs. Like any computer this does not happen instantly. Figure 2.10 shows the basic operation cycle of a PLC. When power is turned on initially the PLC does a quick sanity check to ensure that the hardware is working prop-erly. If there is a problem the PLC will halt and indicate there is an error. For example, if the PLC backup battery is low and power was lost, the memory will be corrupt and this will result in a fault. If the PLC passes the sanity check it will then scan (read) all the inputs. After the inputs values are stored in memory the ladder logic will be scanned (solved) using the stored values - not the current values. This is done to prevent logic problems when inputs change during the ladder logic scan. When the ladder logic scan is complete the outputs will be scanned (the output values will be changed). After this the system goes back to do a sanity check, and the loop continues indefinitely. Unlike normal computers, the entire program will be run every scan. Typical times for each of the stages is in the order of milliseconds.Figure 2.10 The Scan Cycle of a PLC4 Ladder Logic InputsPLC inputs are easily represented in ladder logic. In Figure 2.11there are three types of inputs shown. The first two are normally open and normally closed inputs, dis-cussed previously. The IIT (Immediate InpuT) function allows inputs to be read after the input scan, while the ladder logic is being scanned. This allows ladder logic to examine input values more often than once every cycle.Figure 2.11 Ladder Logic Inputs5 Ladder Logic OutputsIn ladder logic there are multiple types of outputs, but these are not consistently available on all PLCs. Some of the outputs will be externally connected to devices outside the PLC, but it is also possible to use internal memory locations in the PLC. Six types of outputs are shown in Figure 2.12. The first is a normal output, when energized the output will turn on, and energize an output. The circle with a diagonal line through is a normally on output. When energized the output will turn off. This type of output is not available on all PLC types. When initially energized the OSR (One Shot Relay) instruction will turn on for one scan, but then be off for all scans after, until it is turned off. The L (latch) and U (unlatch) instructions can be used to lock outputs on. When an L output is energized the output will turn on indefinitely, even when the output coil is deenergized. The output can only be turned off using a U output. The last instruction is the IOT (Immediate OutpuT) that will allow outputs to be updated without having to wait for the ladder logic scan to be completed.Figure 2.12 Ladder Logic Outputs6components of the structure of PLCFrom the structural points, PLC is divided into fixed and modular (modular) two. Fixed PLC, including CPU boards, I / O board, display panel, memory blocks, power and so on, these elements are not removable into a whole. Modular PLC including the CPU module, I / O modules, memory, power supply modules, backplane, or chassis, these modules can be configured according to certain rules of combination.1CPU compositionCPU is the core of PLC, since the role of the nerve center, each PLC has at least a CPU, it is by the PLC system program functions entrusted to receive and store user programs and data, by scanning the scene by way of acquisition of the status of input devices sent or data, and deposited into the register provided at the same time, diagnostic power and PLC internal circuit of job status and programming in the process of grammar errors. To enter the running, from the user program memory in one by one to read instructions, and then analyzed according to instructions provided for the mission to produce control signals to command-relatedcontrol circuit.In the user view, unnecessarily detailed analysis of CPU's internal circuitry, but the working mechanism of the various parts of or should have sufficient understanding. CPU Control CPU controller job, which will read the instructions to explain the implementation of directives and instructions. However, the pace of work by the shock signal control. Computing devices used in digital or logic operations, under the command of the controller job. Register to participate in operations, and store operations between the results, it is under the command of the controller job.CPU speed and memory capacity are important parameters of the PLC, which determines the speed of PLC work, IO and software capacity, such as quantity, thereby limiting the size of the control.2I / O modulePLC interface with the electrical circuit, in part through the input and output (I / O) completed. I / O Module integrates with PLC's I / O circuits, the input registers to reflect the state of the input signal, the output reflects the state of the output latch. Electrical signal input module will be converted into digital signal into the PLC system, the opposite output module. I / O switch is divided into input (DI), switching output (DO), Analog Input (AI), analog output (AO) modules.3 commonly used I / O is as follows:Switching capacity: according to voltage level points have 220VAC, 110VAC, 24VDC, by isolation points, the relay has isolation and transistor isolation.Analog: According to signal the type of points and have current-mode (4-20mA ,0-20mA), voltage-type (0-10V ,0-5V,-10-10V) and so on, according to the accuracy of points, has 12bit, 14bit, 16bit, etc. .In addition to these general-purpose IO, there are special IO modules, such as thermal resistance, thermocouple, pulse and other modules. According to I / O points determine the module specifications and quantity, I / O module can be as much or as little, but the maximum number by the CPU can manage the capacity of the basic configuration, that is, by the biggest slot backplane or rack limit.Power Supply ModulePLC power supply module for the PLC to provide the work of power integrated circuits. At the same time, some for the input circuit to provide 24V power supply work. Power input types are: AC power (220VAC or 110VAC), DC power supply (commonly used to 24VDC).Backplane or rackMost of the use of modular PLC backplane or rack, and its role are: Electric, the implementation of the links between modules, so that CPU can access all the modules backplane, machines, the implementation of the inter-module connections, so that each module constitute a whole.4PLC system other equipmentProgramming equipment: PLC programming is the development and application, monitoring operations, to check the maintenance of an indispensable device for programming, to make some settings on the system, control by PLC and PLC-controlled systems working conditions, but it does not directly involved in control of running the site. Small PLC programmer generally have hand-held programmer, the current general by a computer (running programming software) to serve as the programmer. That is, our system PC.。

电气专业英语-plc概述-翻译 (1)

许多不同过程的自动化，比如控制生产机械或工厂流水线，这些都是有可称为可编程逻辑控制器（PLC）的小型计算机来完成的。

可编程逻辑控制器是通用技术公司在1968年为了用电子控制器代接线的继电气系统而开发的。

随着可编程逻辑控制器的出现，集中控制工厂生产线的能力，尤其是在汽车工业上得到了重大的发展。

PLC的构架可编程逻辑控制器是一个无磁紧密型计算机，它包含了所有的必需的软件和连接程序的硬件接口。

他们通常用于自动化的控制应用。

（如：闭合回路控制）可以独立存在或者链接到分布的WorldFIP,MPI,PROFIBUS或者Ethernet..3-3A-1向我们展示了一个典型的PLC系统，它是创建在MIP和PROFIBUS上的。

一个典型的PLC组成由：●电源；●程序运行的CPU；●输入输出模块；●可选通信模块。

可用I/O模块支持很多的电气接口：●模拟模块（+/-10v,+/-1v,4-20mA,resistor.edc）；●温度测量模块(pt100,NI 100,etc)；●数字模块（±24V,220V,etc.）；●TTL模块（Beckhoff I/O模块，etc.）；●RS 232模块；●其他。

这些模块可以连接到PLC的内部总线上，也可以通过总线连接器和现场总线单元（如：PROFIBUS,WorldFIP or CAN）连接，并与其他PLC共享总线。

用户的硬件很难和PLC内部总线连接起来，解决的方案是使用特定接口卡（如：HMS的AnyBus卡）作为标准现场总线接口（如PROFIBUS,CAN和World FIP）继承用户硬件。

现在，PLC提供基于以太网的通信。

尽管基于TPC/IP和IEEE802.2,每个厂商的PLC协议不同。

因此，默认情况下，不同厂商的PLC不能通过以太网连接数据。

但是Schneider的PLC拥有接口库，可以用西门子的PLC实现RFC1006,也可以用OPC DX服务器，SCADA应用，或者特定接口卡，如APPLICOM one,作为网关。

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An Introduction to
PLC
An Introduction to PLC
The PLC in the PLC draft standards issued by the International Electrotechnical Commission in 1987 made the following definition: "the PLC is a specially designed for applications in industrial environments digital computing operation of electronic devices which can be programmed memory
The working principle of PLC is
Put into operation when the programmable logic controller, the course of their work is generally
divided into three stages, that is, the input sample,
processes
The characteristics of PLC are：
High reliability, strong anti-jamming capability ； Complete, fully functional, the applicability；Easy
to use, well received by engineers and technicians
The composition of PLC
PLC is divided into fixed and modular (modular) two points from the structure. / O board, display panel, memory blocks, power, and these elements are combined into a non-removable as a whole. Modular PLC CPU module, I / O modules, memory, power supply modules, backplane or rack, these modules can be combined according to certain rules configuration.
The history of the development of PLC is
In 1969, the United States developed the world's first PDP-14;
In 1971, Japan developed the first DCS-8;
In 1973, Germany developed the first PLC;
arithmetic operations, such as operating
instructions in its internal storage and can be digital or analog inputs and outputs to control
various types of machinery or production
In 1974, the Chinese developed the first PLC.
In 1971, Japan developed the first DCS-8;
The role of PLC is to with
The role of PLC is to with to implementation of the logical, sequential operation, timing, counting and
the user program execution and output refresh three stages. Completion of the three stages is
called a scan cycle. During the entire operation,
the CPU of the programmable logic controller scan speed, repeat the above three stages.
welcome；System design, construction workload is small, easy to maintain, easy to transform
Small size, light weight, low energy consumption；
PLC is an ideal control device for mechatronics.
The impact of PLC
He simplifies the complex relay circuit into a program diagram, and his graphical programming language is very easy to handle, and the program is very easy to modify with a relay contactor, simplifying the workload of the electrical industry staff and directly improving the production efficiency of the industrial sector

An Introduction to PLC 英语介绍

PLC的英文作文

PLC工程师的英语自我介绍

Introduction of PLC

自动化专业英语——Introductions to PLC

PLC技术中英文翻译可编程控制器技术(英语原文中文翻译)

PLC的介绍（英文）

推荐plc英文小作文

PLC的英文介绍

介绍plc英语作文

PLC基础知识简介外文文献翻译、中英文翻译、外文翻译

数控技术专业英语(第2版)：Unit 5 Introduction to PLC

plc工程师 英语口语

中英文文献翻译-PLC控制器的简介

PLC的英文作文

外文翻译(英)PLC Introduction

电气专业英语-plc概述-翻译 (1)

plc工程师英语口语