描述
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一定范围之内。即使是合格的电缆，当电缆长度超过一定长度时，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。
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