12HGA11J52
12HGA11J52
12HGA11J52
12HGA11J52
可编程序控制器(Programmable Controller)原本应简称PC，为了与个人计算机专称PC相区别，所以可编程序控制器简称定为PLC(Programmable Logic Controller)，但并非说PLC只能控制逻辑信号。PLC是专门针对工业环境应用设计的，自带直观、简单并易于掌握编程语言环境的工业现场控制装置。
PLC的基本组成
PLC基本组成包括中央处理器(CPU)、存储器、输入/输出接口(缩写为I/O，包括输入接口、输出接口、外部设备接口、扩展接口等)、外部设备编程器及电源模块组成，见图1。PLC内部各组成单元之间通过电源总线、控制总线、地址总线和数据总线连接，外部则根据实际控制对象配置相应设备与控制装置构成PLC控制系统。
图1 PLC的基本组成
1. 中央处理器
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16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。
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