描述
输入接口中都有滤波电路及耦合隔离电路。滤波有抗干扰的作用,耦合有抗干扰及产生标准信号的作用。图中,输入接口的电源部分都画在了输入口外(虚线框外),这是分体式输入口的画法,在一般单元式可编程控制器中输入口都使用可编程控制器本身的直流电源供电,不再需要外接电源。
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