Description
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）等模块。开关量是指只有开和关（或1和0）两种状态的信号,模拟量是指连续变化的量。
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