EM235,温度传感器,RS485通信
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PLC PLC PLC PLC AD EM235 RS485
PLC
EM235
RS485
www.PLCworld.cn
Abstract
In the scientific research and production practice in many fields, Temperature control has very important position.Especially in food, awning greenhouse, metallurgy, chemical industry, building materials, machinery, petroleum and other industrial and agricultural production that plays an important role. Along with the development of electronic and computer technology, by original simple logic quantity control, and gradually has the computer control system of the function, because in the computing power, anti-interference ability , response speed, communication networking ability, flexibility and maintainability, and other aspects of the many other advantages, PLC in temperature control system got a lot of use, this paper introduces the design of multi-channel based on PLC temperature gathering system. In PLC control as the core of multi-channel temperature gathering device, temperature voltage signal analogue into the digital quantity through the EM235. PLC is carries on the data processing for the transformation of the digital by AD. And then by RS485 communication to a single chip microcomputer temperature display modules of the display. Key words PLC EM235 Temperature sensor RS485 communications
益益
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........................................................................................................................................ 1 1 1.1 1.2 1.3 2 2.1 2.2 PLC ........................................................................................................................ 3 ..................................................................................................................... 3 ............................................................................................................. 3 ............................................................................................................. 3 ........................................................................................................................ 5 ............................................................................................................................. 5 S7-226CPU.................................................................................................. 5 ...........................................................................................................5 ...................................................................................................6 .........................................................................................6 ......................................................................................................... 8 .......................................................................................... 8 .............................................................................................. 8 .............................................................................................. 9 .........................................................................................11 ....................................................................................................... 13 2.4.1 Pt100 2.4.2 2.4.3 2.5 2.5.1 2.5.2 2.5.3 2.5.4 2.5.5 2.6 ................................................................................................... 13 ......................................................................................... 13 ........................................................................................ 14 ............................................................................................................... 16 ............................................................................................ 16 .................................................................................... 16 ................................................................................................ 17 ................................................................................................ 19 .......................Fra Baidu bibliotek........................................................................ 19 ........................................................................................................... 19 2.2.1 CPU 2.2.2 CPU 2.2.3 CPU226 2.3 EM235 2.3.1 EM235 2.3.2 EM235 2.3.3 EM235 2.3.4 EM235 2.4
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2.6.1 Atmega16 2.6.2 74HC595 2.7 RS485 2.7.1 RS485 2.7.2 S7-200CPU 3 3.1 3.1.1 PLC 3.1.2 3.2 3.2.1 3.2.2 3.3 3.3.1 3.3.2 PLC 3.3.3 4
............................................................................................ 19 ......................................................................................... 20 ..............................................................................................21 ......................................................................................... 22
PLC PLC PLC PLC AD EM235 RS485
PLC
EM235
RS485
www.PLCworld.cn
Abstract
In the scientific research and production practice in many fields, Temperature control has very important position.Especially in food, awning greenhouse, metallurgy, chemical industry, building materials, machinery, petroleum and other industrial and agricultural production that plays an important role. Along with the development of electronic and computer technology, by original simple logic quantity control, and gradually has the computer control system of the function, because in the computing power, anti-interference ability , response speed, communication networking ability, flexibility and maintainability, and other aspects of the many other advantages, PLC in temperature control system got a lot of use, this paper introduces the design of multi-channel based on PLC temperature gathering system. In PLC control as the core of multi-channel temperature gathering device, temperature voltage signal analogue into the digital quantity through the EM235. PLC is carries on the data processing for the transformation of the digital by AD. And then by RS485 communication to a single chip microcomputer temperature display modules of the display. Key words PLC EM235 Temperature sensor RS485 communications
益益
www.PLCworld.cn
........................................................................................................................................ 1 1 1.1 1.2 1.3 2 2.1 2.2 PLC ........................................................................................................................ 3 ..................................................................................................................... 3 ............................................................................................................. 3 ............................................................................................................. 3 ........................................................................................................................ 5 ............................................................................................................................. 5 S7-226CPU.................................................................................................. 5 ...........................................................................................................5 ...................................................................................................6 .........................................................................................6 ......................................................................................................... 8 .......................................................................................... 8 .............................................................................................. 8 .............................................................................................. 9 .........................................................................................11 ....................................................................................................... 13 2.4.1 Pt100 2.4.2 2.4.3 2.5 2.5.1 2.5.2 2.5.3 2.5.4 2.5.5 2.6 ................................................................................................... 13 ......................................................................................... 13 ........................................................................................ 14 ............................................................................................................... 16 ............................................................................................ 16 .................................................................................... 16 ................................................................................................ 17 ................................................................................................ 19 .......................Fra Baidu bibliotek........................................................................ 19 ........................................................................................................... 19 2.2.1 CPU 2.2.2 CPU 2.2.3 CPU226 2.3 EM235 2.3.1 EM235 2.3.2 EM235 2.3.3 EM235 2.3.4 EM235 2.4
.................................................................................................................21
www.PLCworld.cn
2.6.1 Atmega16 2.6.2 74HC595 2.7 RS485 2.7.1 RS485 2.7.2 S7-200CPU 3 3.1 3.1.1 PLC 3.1.2 3.2 3.2.1 3.2.2 3.3 3.3.1 3.3.2 PLC 3.3.3 4
............................................................................................ 19 ......................................................................................... 20 ..............................................................................................21 ......................................................................................... 22