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The structure of various PLCs is basically the same,mainly composed of CPU,power supply,storage and input and output interface circuits.

plc processor

The plc processor unit is generally composed of a controller,an arithmetic unit and a register.The CPU is connected with the storage unit,the input and output interface,the communication interface and the expansion interface through the address bus,the data bus and the control bus.The CPU is the core of the PLC.It continuously collects input signals,executes user programs,and refreshes system outputs.

各种PLC的组成结构基本相同，主要有CPU,电源，储存器和输入输出接口电路等组成。

plc处理器

plc处理器单元一般由控制器、运算器和寄存器组成。CPU通过地址总线、数据总线、控制总线与储存单元、输入输出接口、通信接口、扩展接口相连。CPU是PLC的核心，它不断采集输入信号，执行用户程序，刷新系统输出。