【机械专业英文文献】可编程控制器设计的气动系统

附件2：外文原文

Programmable Controller Designed for

Electro-pneumatic Systems

Summary this item is mainly the procedure which studies electricity system and in brief valid control current of air to launch machine to compatibly flow the appearance of system. It of the fulfillment foundation include according to the control procedure of particularly have of the current of air controller, automation design, current of air system and design according to the electronics of the tiny controller.

1. Brief introduction

The automation which uses an electricity technique mainly constitutes to. from 3 part: Launch machine or motor, sensor or button, the form is zero partses such as the control of flower petal. Now, greatly part of system logic the controllers of the operation drive all procedure logic controller (PLC) replace. PLC sensor and switch's aring an importation to carry, but launch the direct control valve of machine is an exportation to carry and have an internal procedure to operate among them all circulate essential logic, imitate other devices like calculator, in fixed time machine etc., carry on a control to the whole movement appearance of system.

Can according to need numerous time to establish and imitate thus of system, so all from PLC usage, this item contains vivid advantage. Therefore can save time, the danger of decrease error, in the meantime under the sistuation that use same material, it can be getting more precise.

Many company that is on the market used the PLC of normal regulations and it can not only control with the current of air system, but also can use various electricity equipments. PLC wide range of application, can be apply in much industry to produce medium, even used for safety and automation of building in.

Because of above various characteristic, the PLC provided a lot of resourceses in somely physically appliedly, even include not a resources of control the system and the electricity system was a kind of application like this.For the engineering of automation, the PLC usage is more expensive, particularly

is to those small scaled systems.

Aim at this kind of circumstance's a kind of viable way establish a controller that can provide particular size and function. This kind of controller can create according to the tiny controller.

This kind of applies scope according to the tiny controller smaller, the machine that can used for a type perhaps can use to do a be like the common PLC is similar and can be woven a distance of controller, so it can pass variable turn of logic procedure to carry on various homework. All of these characteristic basis concrete demand of dissimilarity but dissimilarity, concrete of design of empirical of dissimilarity but dissimilarity. But the main advantage of this kind of design lie in designing a personnel to understand an own controller very much, can freely control the big baby size of controller, change it of function. This means that this item contains more special, but in the meantime the control of system also from it of design control.

2. Electricity system

People can find out to speak of in three preceding contexts from an automation of basic parts, the in addition is a logic circuit which controls system. The technique of only mature forerunner cans make a particular logic circuit and performance the parts that exactitude need when operate to get stripe. For a simple sport, the system auto procedure can complete, but for indirect or more complicated sport, the procedure of system will produce complicated circuit and false signal. This is need another method can save time, produce clear circuit, can keep accidental signal from hand over fold to stop with circuit.

The line roadbed method of different standard of this kind of way call follow the sequence and advance gradually type or rule system, it to the current of air and the electricity system very valid, and is also a foundation of this item. It include according to launch the system of foundation that the machine appearance each dissimilarity variety establish.