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Programmable controller (PC for short). Different from the PC of personal computer, it is represented by PLC. PLC is a new generation of industrial control device formed by introducing microelectronics technology, computer technology, automatic control technology and communication technology on the basis of traditional sequential controller. Its purpose is to replace relays, execute logic, timekeeping, counting and other sequential control functions. It is used to store programs internally, execute user-oriented instructions such as logical operations, sequential control, timing, counting and arithmetic operations, and control various types of machinery or production processes through digital or analog input/output. PLC can be understood as a simple PC.

Functionally, the functions realized by PLC can be easily realized by PC, if the cost is not considered. However, the primary feature of industrial products is stability, which is above all else. Computer programs can be restarted if they are broken, but PLC cannot. Imagine that a large factory needs to be restarted after running for a period of time, which will cause a lot of waste of raw materials and labor. PLC has the characteristics of strong versatility, easy use, wide adaptability, high reliability, strong anti-interference ability and simple programming. PLC programs include both the manufacturer's system programs and the application programs developed by users themselves. The system programs provide a running platform, and at the same time, they also perform necessary public processing for the reliable operation of PLC programs and information and information conversion. User programs are designed by users according to control requirements. Generally speaking, PLCs are divided into two types: box-type and modular. But their composition is the same. For box-type PLCs, there is a CPU board, I/O board, display panel, memory block, power supply, etc. Of course, they are divided into several models according to CPU performance, and there are several specifications according to the number of I/O points. For modular PLCs, there are CPU modules, I/O modules, memory, power modules, base plates or racks. PLCs of any structural type belong to bus-type open structures, and their I/O capabilities can be expanded and combined according to user needs. PLCs have the characteristics of strong versatility, easy use, wide adaptability, high reliability, strong anti-interference ability, and simple programming. It can be expected that in the field of industrial control, the application of PLC control technology will surely form a world trend.

PLC programs include both manufacturer's system programs and user-developed applications. System programs provide a running platform and also perform necessary public processing for the reliable operation of PLC programs and information and information conversion. User programs are designed by users according to control requirements. Generally speaking, PLCs are divided into two types: box-type and modular. But their composition is the same. For box-type PLCs, there is a CPU board, I/O board, display panel, memory block, power supply, etc. Of course, there are several models according to CPU performance, and there are several specifications according to I/O points. For modular PLCs, there are CPU modules, I/O modules, memory, power modules, base plates or racks. PLCs of any structural type are all bus-type open structures, and their I/O capabilities can be expanded and combined according to user needs.

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