例如，如果系統(tǒng)的看門狗計(jì)時(shí)器設(shè)置為200ms，智能總線的掃描周期為5ms,當(dāng)首要單元的主機(jī)架掉電時(shí)，擴(kuò)展單元中的智能總線控制器等待400ms的時(shí)間后停止更新智能設(shè)備的輸出。再過15ms后，智能設(shè)備會(huì)使用備份單元中的數(shù)據(jù)作為輸出。需要注意的是主機(jī)架中的所有智能控制器也會(huì)停止輸出，因?yàn)橹鳈C(jī)架已經(jīng)掉電。連接到此總線上的智能設(shè)備會(huì)在15ms內(nèi)使用備份單元上的數(shù)據(jù)。

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