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and due to years of usage habits, people still frequently use the term programmable logic controller and continue to use the abbreviation PLC in terminology

The full English name of PLC is: Programmable Logic Controller, an electronic system for digital operations designed specifically for industrial applications. It uses a type of programmable memory for storing programs internally

executing logic operations, sequential control, timing, counting, and arithmetic operations for user oriented instructions, and controlling various types of mechanical or production processes through digital or analog input/output. It is the core part of industrial control

PLC controller mainly refers to a programmable logic controller for digital operation of electronic systems, used to control the production process of machinery. It is also an abbreviation for the names of public limited companies, power line vehicles, etc

PLC is essentially a computer dedicated to industrial control, with a hardware structure that is basically the same as a microcomputer, consisting of:

a. Power supply

The power supply of PLC plays a very important role in the entire system. If there is no good and reliable power system, it cannot work properly, so PLC manufacturers also attach great importance to the design and manufacturing of power supplies

Generally, the fluctuation of AC voltage is within the range of+10% (+15%), and the PLC can be directly connected to the AC power grid without taking other measures

b. Central Processing Unit (CPU)

The central processing unit (CPU) is the control center of the PLC