Answer: There are many definitions of PLC. The International Electrotechnical Commission (IEC) defines PLC as follows: PLC (Programmable Controller) is an electronic system for digital operation, designed for use in industrial environments. It uses programmable memory to store instructions for performing logical operations, sequential control, timing, counting and arithmetic operations, and controls various types of machinery or production processes through digital and analog input and output. Programmable controllers and related equipment should be designed according to the principle of easy integration with industrial control systems and easy expansion of their functions.
PLC has the characteristics of strong versatility, easy use, wide adaptability, high reliability, strong anti-interference ability, and simple programming. The position of PLC in industrial automation control, especially sequential control, will be irreplaceable in the foreseeable future.
