Description
PLC通讯线是经过滑环引出的。考虑到前几天刚下过雨,怀疑是滑环进水导致的PLC通讯线短路,而烧坏PLC端口的。用摇表测量通讯线(线路两头均悬空),发现通讯线间有电阻,正常时应为无穷大,而测量时,电阻在5M~10M之间。然后确定PLC端口烧坏是滑环进水形成的,替换滑环后正常。
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