IC697MDL654
IC697MDL654
IC697MDL654
仲鑫達自動化-您身邊的工業自動化備件專家
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PLC係統的正常供電電源均由電網供電。由於電網覆蓋範圍廣,將受到所有空間電磁幹擾而在線路上感應電壓和電路。尤其是電網內部的變化,入開關操作浪涌、大型電力設備起停、交直流轉動裝置引起的諧波、電網短路暫態衝擊等,都通過輸電線路到電源邊。PLC電源通常採用隔離電源,但其機構及制造工藝因素使其隔離性並不理想。實際上,由於分布參數特別是分布電容的存在,隔離是不可能的。
(4)來自信號線引入的幹擾
與PLC控制係統連接的各類信號傳輸線,除了傳輸有效的各類信號之外,總會有外部幹擾信號侵入。此幹擾主要有兩種途徑:一是通過變送器或共用信號儀表的供電電源串入的電網幹擾,這往往被忽略;二是信號線受空間電磁輻射感應的幹擾,即信號線上的外部感應幹擾,這是很嚴重的。由信號引入幹擾會引起I/O信號工作異常和測量精度大大降低,嚴重時將引起元器件損傷。對於隔離性能差的係統,還將導致信號間互相幹擾,引起共地係統總線回流,造成邏輯數據變化、誤動。PLC控制係統因信號引入幹擾造成I/O模件損壞數相當嚴重,由此引起係統故障的情況也很多。
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