中央处理器(CPU)由控制器、运算器和寄存器组成并集成在一个芯片内。 CPU通过数据总线总线、地址总线、控制总
线和电源总线与存储器、输入输出接口、编程器和电源相连接。
小型PLC的CPU采用8位或1 6位微处理器或单片机，如8031、M68000等，这类芯片价格很低;中型PLC的CPU采用
16位或32位微处理器或单片机，如8086、96系列单片机等,这类芯片主要特点是集成度高、运算速度快且可靠性
高;而大型PLC则需采用高速位片式微处理器。
CPU按照PLC内系统程序赋予的功能指挥PLC控制系统完成各项I作任务。
1. From Qianda Engineering
The central processing unit (CPU) is composed of controller, arithmetic unit and register and integrated into a chip. CPU through data bus, address bus, control master
Line and power bus are connected with memory, input and output interface, programmer and power supply.
The CPU of Small PLC adopts 8-bit or 16 bit microprocessor or single chip microcomputer, such as 8031, M6800, etc. the price of this kind of chip is very low; CPU of medium-sized PLC adopts
16 bit or 32-bit microprocessor or single chip microcomputer, such as 8086, 96 series single chip microcomputer, etc. these chips are mainly characterized by high integration, fast operation speed and reliability
High; Large PLC needs high-speed bit chip microprocessor.
The CPU commands the PLC control system to complete various I tasks according to the functions given by the system program in the PLC.
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