與PLC控制系統(tǒng)連接的各類信號傳輸線，除了傳輸有效的各類信號之外，總會有外部*信號侵入。此*主要有兩種途徑：一是通過變送器或共用信號儀表的供電電源串入的電網(wǎng)*，這往往被忽略；二是信號線受空間電磁輻射感應(yīng)的*，即信號線上的外部感應(yīng)*，這是很嚴(yán)重的。由信號引入*會引起I/O信號工作異常和測量精度大大降低，嚴(yán)重時將引起元器件損傷。對于隔離性能差的系統(tǒng)，還將導(dǎo)致信號間互相*，引起共地系統(tǒng)總線回流，造成邏輯數(shù)據(jù)變化、誤動和死機(jī)。PLC控制系統(tǒng)因信號引入*造成I/O模件損壞數(shù)相當(dāng)嚴(yán)重，由此引起系統(tǒng)故障的情況也很多。
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