前言
plc与电气回路的接口，是通过输入输出部分（i/o）完成的。i/o模块集成了plc的i/o电路，其输入暂存器反映输入信号状态，输出点反映输出锁存器状态。输入模块将电信号变换成数字信号进入plc系统，输出模块相反。i/o分为开关量输入（di），开关量输出（do），模拟量输入（ai），模拟量输出（ao）等模 b
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