PLC programmable controller of the generation and development process

In the 1960 s, computer technology has been applied in industrial control. But because of the complexity of computer technology, programming difficulty is high, difficult to adapt to harsh industrial environment and expensive, not widely used in industrial control. At the time of industrial control, mainly based on relay - Contactor control system. In 1968, America's biggest carmaker - — General motors manufacturing company ( GM） , in order to adapt to the car model, trying to find a new kind of industrial controller, to minimize redesign and replacement of the relay control system hardware and wiring, reduce time, reduce the cost. So imagine the perfect function of the computer, the advantages of flexible and general and relay control system of simple, easy to operate, combine the advantages of cheap, make a kind of general control device is suitable for the industrial environment, and computer programming method and simplify the input program, with 'face control process, object-oriented' programming 'natural language', people are not familiar with computer can be used conveniently. Namely: hardware: reduce software: simple flexible according to the above assumptions, puts forward the new general motors controller must have the top ten conditions ( The famous 'article GM10') : 1, simple programming, can modify the program at the scene sequence 2 maintenance convenience, it is best to plug-in 3 reliability is higher than the relay volume less than 4 relay control cabinet 5 data directly into the management of computer can be 6 7 input on cost can compete with relay control cabinet can be ac 115 v8 output can be ac 115 v, 2 a) above, can be directly driven solenoid valve 9 when extended, the original system as long as a small change in 10 at least could extend to the user program memory capacity k1969 4 years, the digital equipment corporation ( GEC） First successfully developed the first programmable controller, and a successful trial on gm's automatic assembly line, so as to create a new situation of the industrial control. Then, the United States the MODICON company also developed a programmable controller 084. In 1971, introduced the new technology from the United States, Japan, quickly developed the first programmable controller DSC - Japan 8. In 1973, western European countries have developed their first programmable controller. Our country since 1974, in 1977 began to industrial application. Early programmable controller is to replace the relay control circuit, stored program instruction and finish the sequential control design. It is mainly used for: 1. Logic operation 2. Sequential control, timing, counting and switch quantity control. So, often referred to as programmable logic controllers ( PLC— 可编程逻辑控制器) 。 Into the 70 s, with the development of microelectronics technology, PLC controller used the general microprocessor, the controller is no longer limited to the original logic operation, function is growing. Therefore, actually should be called the PC - — The programmable controller. To the 80 s, with large scale and very large scale integrated circuit and microelectronic technology development, made up of 16 - and 32-bit microprocessor is microcomputer PC got remarkable development. Make the PC in the concept, design, performance, price and application, etc all have new breakthrough. Not only enhanced control function, and power consumption reduced volume, cost reduction, increased reliability, programming and failure detection is more flexible and convenient, and with the remote I/O and communication network, data processing and the development of the image display, and make the PC to the direction of control used in continuous production process, has become one of the pillars of industrial production automation.
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