There are many definitions of PLC. The International Electrotechnical Commission (IEC) defines PLC as: A programmable controller is an electronic system that operates digitally, designed for use in an industrial environment. It uses a programmable memory to store instructions for performing logical operations, sequence control, timing, counting and arithmetic operations, and controls various types of operations through digital and analog inputs and outputs. machinery or production process. The programmable logic controller and its related equipment should be designed according to the principle of being easy to form a whole with the industrial control system and easy to expand its functions.
From the 1980s to the mid-1990s, PLC was the fastest growing period, with an annual growth rate of 30-40%. During this period, PLC’s ability to process analog quantities, digital computing, man-machine interface and network has been greatly improved, and PLC has gradually entered the field of process control, replacing the dominant DCS in the field of process control in some applications. system.
PLC has the characteristics of strong versatility, convenient use, wide adaptability, high reliability, strong anti-interference ability, and simple programming. The position of PLC in industrial automation control, especially sequence control, cannot be replaced in the foreseeable future.
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