例如，如果系統(tǒng)的看門狗計時器設置為200ms，智能總線的掃描周期為5ms,當首要單元的主機架掉電時，擴展單元中的智能總線控制器等待400ms的時間后停止更新智能設備的輸出。再過15ms后，智能設備會使用備份單元中的數據作為輸出。需要注意的是主機架中的所有智能控制器也會停止輸出，因為主機架已經掉電。連接到此總線上的智能設備會在15ms內使用備份單元上的數據。

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