Description
则应去检查输入对应的外部回路；若输入信号已经采集到，则再看PLC是否有相应输出指示，若没有，则是内部程序问题或输出LED指示灯问题；若输出信号已确信发出，则应去检查外部输出回路（从PLC输出往后检查）。在输出回路中
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