功能請求模塊#43的作用是使備份單元不接收從激活單元過來的傳輸數(shù)據(jù)。它的作用是確定備份單元采集的輸入數(shù)據(jù)是否正確(意味著該單元是輸入數(shù)據(jù)掃描的值有效)。還可以確定備用單元計算的邏輯輸出和內(nèi)部變量是否正確(意味著使邏輯處理單元處理有效)。這項功能只能在備份單元中實現(xiàn)。如果不在同步狀態(tài)下此值失效，在激活單元里也是沒有作用的。

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