停止備份單元的輸出會冒控制不同步切換的危險(這會導致輸出的突變)。當激活單元發(fā)生錯誤或者掉電時而備份單元的輸出使能時，就可能發(fā)生此類錯誤。但是，當如果激活單元錯誤或掉電并且備份單元的輸出使能時，系統(tǒng)的輸出被指定到他們默認的連接上。備份單元輸出使能的第二個作用是，激活單元確定不同步時的錯誤列表中的動作哪個是致命的失誤。

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