作為替代，它使用用戶配置的故障動作列表，因為此時沒有備份單元來驅動輸出。3.因為冗余的智能輸出總是從激活單元傳送到備份單元，如果任意單元被使能，智能總線設備總是接收到激活單元計算得出的輸出變量狀態(tài)。注意:如果備用單元處于“運行/禁止”狀態(tài)時，當激活單元發(fā)生故陶時，備用單元不能驅動輸出，所有它不是實現(xiàn)備用功能。

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