Description
在关断时仍有较大的漏电流。而PLC的输入继电器灵敏度较高，若漏电流干扰超过一定值，就形成了误信号。同样，当输出元件为VTH（双向晶体闸管）或是晶体管输出，而外部负载又很小时，会因为这类输出元件在关断时有较大的漏电流
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