在PLC存貯程序塊或其它數(shù)據(jù)期間.故障組“存貯過程的通訊故障”便出現(xiàn)。存貯程序塊與數(shù)據(jù)的命令流,始于一個(gè)專門的開始時(shí)序指令,終止于一個(gè)結(jié)束時(shí)序指令。當(dāng)與執(zhí)行存貯的編程設(shè)備的通訊被中斷,或終止裝載的任何其它故障發(fā)生時(shí)，這類故障將被記錄在故障表中。只要系統(tǒng)存在這種故障,控制器將不轉(zhuǎn)人RUN狀態(tài)。這類故障不會(huì)由于接通電源而自動(dòng)清除;用戶必須規(guī)定專門的清除指令。這組故障作用屬致命性的。

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