施耐德产品140DDO35301C Quantum

140DDO35301C Quantum

140DDO35301C

我把控制PLC电源开关来回快速的开关两下，突然我看到PLC上的故障灯微微的闪了一下，看到这，我想PLC的指示灯应该可以点亮，只是外部有严重的故障，才导致PLC上所有的指示灯均不亮，我坚信PLC不会那么轻易损坏，既然故障点不在输出侧，那就从输入侧查。

输入侧值得怀疑的就是COM端，和+24V端，因为+24V端在外口容易拆，我就先拆它，当把这个+24V这根线拆下后，PLC操作面板和部分输入输出点都点亮了，再次接上PLC上的指示灯又都不亮了，问题就出现在这根+24V上。

我延着+24V这个线一直找到端子排的分接处，下面接了好几根线，我用排除法，找到了那根接在+24V端子上的那根线，原来是接在设备上的编码器电源，检查端子到编码器之间的线路没有问题，怀疑是编码器故障，后更换一只新的编码器后，再次上电，PLC各指示灯显示正常了，让操作工测试设备动作正常。

PLC输出端有故障，造成面板指示灯不亮经常遇到，但输入端有故障，造成PLC所有的指示灯均不亮很少见。各位朋友，你们还遇到过哪些情况，可以导致PLC所有的指示灯均不亮的呢？

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