描述
件上都设有接线端子排，为了滤除信号的噪声和便于PLC内部对信号的处理，这些模块上都带有滤波、电平转换、信号锁存电路。数字量输入模块带有广电耦合电路，其目的是把PLC与外部电路隔离起来，以提高PLC的抗干扰能力。数字两输出有继电器输出、晶体管输出和可控硅输出三种方式。模拟量输入/输出模块主要用来实现模拟量与数字量之间的转换，即A/D或D/A转换
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