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Programmable Logic Controller (PLC) was first introduced in the United States in the late 1960s. It was called Programmable Logic Controller (PLC) at that time. It was used to replace relays in order to perform logical judgment, timing, counting and other sequential control functions.

The basic design idea of PLC is to combine the advantages of perfect computer function, flexibility and versatility with the advantages of relay control system, such as simplicity, easy operation and low price. The hardware of the controller is standard and versatile. According to the practical application object, the control content is programmed into software and written into the user program memory of the controller. The controller and the controlled object are easily connected.

With the development of semiconductor technology, especially microprocessor and micro-computer technology, since the mid-1970s, microprocessor has been widely used as the central processing unit in PLC, and medium,

large-scale and even ultra-large-scale integrated circuits have been used in input and output modules and peripheral circuits. At this time, PLC is no longer a logical judgment function, but also has data processing and PID regulation. Data communication function.

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