7、過程通道故障
過程通道出現(xiàn)最多是卡件故障或就地總線故障。一種原因是卡件本身廠時間工作，元器件老化或損壞；另外，因外部信號接地或強點信號串入卡件也會導致通道故障。現(xiàn)在一般卡件本身都采取了良好的隔離措施，一般情況下不會導致故障的擴大，但此類故障一旦出現(xiàn)，則直接造成過程控制或監(jiān)控功能的不正常。所以要及時查明故障原因，及時進行更換卡件。
一次原件或控制設(shè)備出現(xiàn)故障有時不能直接被操作員發(fā)現(xiàn)，只有當參數(shù)異常或報警時，方引起注意?？刂铺幚頇C（過程處理機）故障一般會立即產(chǎn)生報警，引起操作員注意?，F(xiàn)在控制處理機基本上全是采用1：1冗余配置，其中一臺發(fā)生故障不會引起嚴重后果，但應(yīng)立即處理故障的機器。在處理過程中，絕對不可誤動正常的處理機，否則會發(fā)生嚴重的后果。
8、人為故障
對系統(tǒng)進行維護或故障處理，有時會發(fā)生認為誤操作現(xiàn)象，這對于經(jīng)常進行系統(tǒng)維護或新參加系統(tǒng)檢修維護的人員來說都是會發(fā)生的。一般在修改控制邏輯、下裝軟件、重啟設(shè)備或強制設(shè)備，保護信號是最易發(fā)生誤操作事件。輕則導致部分測點、設(shè)備異常，重則造成機組或主要輔機設(shè)備停運，后果是非常嚴重的。在使用的化工廠，人為誤操作發(fā)生的故障在不安全事件中占有很大比例。

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