DS2020PDMAG3

　PLC控制系统主要由输入部分、CPU、采样部分、输出控制和通讯部分组成，如图1所示。输入部分包括控制面板和输入模板；采样部分包括采样控制模板、AD转换模板和传感器；CPU作为系统的核心，完成接收数据，处理数据，输出控制信号；输出部分有的系统用到DA模板，将输出信号转换为模拟量信号，经过功放驱动执行器；大多数系统直接将输出信号给输出模板，由输出模板驱动执行器工作；通讯部分由通讯模板和上位机组成。

 

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