82407381-001

82407381-001

电缆的各导线间都存在电容，合格的电缆能把此容值限制在范围之内。就是合格的电缆，当电缆长度超过长度时，各线间的电容容值也会超过所要求的值，当把此电缆用于PLC输入时，线间电容就有可能引起PLC的误动作，会出现许多无法理解的现象。

主要为：

明明接线正确，但PLC却没有输入；

PLC应该有的输入没有，而不应该有的却有，即PLC输入互相干扰。

近，在调试一PLC系统时，就出现了一种现象。MIC传感器不动作，或动作后，另一传感器（FLY）的动作影响MIC传感器，即：MIC动作时，FLY传感器一动作，MIC就变成不动作了。也就是：传感器的动作彼此影响，怀疑是电缆质量不好，线间电容不合要求造成的。直接把MIC传感器接到PLC，不使用电缆后，动作正常。

82407381-001  

82407381-001

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