描述
In the 1960s, computer technology has been applied to industrial control. However, due to the complexity of computer technology itself
It is not widely used in industrial control due to reasons such as high programming difficulty, difficulty in adapting to harsh industrial environments, and high price. At that time, the industrial control mainly consisted of relay-contactor control system.
In 1968, the largest automobile manufacturer in the United States, General Motors Manufacturing Company (GM), tried to find a new type of industrial controller in order to adapt to the continuous renovation of automobile models, so as to reduce the redesign and replacement of the hardware of the relay control system as much as possible. and wiring, reducing time and cost. Therefore, it is envisaged to combine the advantages of the computer’s complete functions, flexibility and generality with the simple and easy-to-understand, easy-to-operate, and low-cost advantages of the relay control system to make a general-purpose control device suitable for the industrial environment, and to program the computer. The method and program input method are simplified, and the “natural language” of “control process-oriented, object-oriented” is used for programming, so that people who are not familiar with computers can also use it conveniently. which is:
Hardware: reduce
Software: Flexible Simple
In response to the above assumptions, General Motors proposed ten conditions that this new controller must have (the famous “GM10”):
1 The programming is simple, and the program can be modified on the spot
2 Easy to maintain, preferably plug-in
3 The reliability is higher than that of the relay control cabinet
4 smaller than the relay control cabinet
5 Data can be sent directly to the management computer
6 Competitive with relay control cabinets in cost
7 Inputs can be AC 115V
8 The output can be AC 115V, above 2A, can directly drive the solenoid valve
9 When expanding, the original system requires only minor changes
10 User program memory capacity can be expanded to at least 4K
In 1969, the United States Digital Equipment Corporation (GEC) first successfully developed the first programmable logic controller, and successfully tried it on the automatic assembly line of General Motors, thus creating a new situation in industrial control.
Then, the US MODICON company also developed the programmable logic controller 084.
In 1971, Japan introduced this new technology from the United States, and soon developed Japan’s first programmable logic controller DSC-8. In 1973, Western European countries also developed their first programmable logic controller . my country began to develop it in 1974 and began industrial application in 1977. Early programmable controllers were designed to replace relay control circuits, store program instructions, and complete sequential control. Mainly used for: 1. Logic operation 2. Timing, counting and other sequential control, all belong to switch control. Therefore, it is usually called a programmable logic controller (PLC-Programmable Logic Controller). In the 1970s, with the development of microelectronics technology, PLC adopted a general-purpose microprocessor, and this kind of controller was no longer limited to the original logic operation, and its functions were continuously enhanced. Therefore, it should actually be called PC – Programmable Logic Controller.
In the 1980s, with the development of microelectronics technologies such as large-scale and ultra-large-scale integrated circuits, microcomputerized PCs composed of 16-bit and 32-bit microprocessors have achieved amazing development. The PC has made new breakthroughs in terms of concept, design, performance, price and application. Not only the control function is enhanced, the power consumption and volume are reduced, the cost is reduced, the reliability is improved, and the programming and fault detection are more flexible and convenient, but also with the development of remote I/O and communication network, data processing and image display, the PC The development to the direction of continuous production process control has become a major pillar for the realization of industrial production automation.
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