Description
首先应检查PLC输入开关电接触点是否可靠(一般可通过查看输入LED指示灯或直接测量输入端),若输入信号未能传到PLC,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
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