SIEMENS 6ES7421-1BL01-0AA0

 分布式處理單元的冗余根據(jù)冗余度可以分為冗余度為1∶1和1∶n兩種情況。這在每個(gè)DCS廠家的產(chǎn)品中是不同的。這兩種方式各有優(yōu)缺點(diǎn)。這里介紹的是冗余度為1∶1的冗余設(shè)置。

    分布處理單元冗余度為1∶1，就是將2塊組態(tài)*一樣的控制器設(shè)置成冗余方式。在投入運(yùn)行時(shí)，若出現(xiàn)故障，兩分布處理單元之間能實(shí)現(xiàn)無(wú)擾動(dòng)切換，保證系統(tǒng)的正常運(yùn)行。

    本系統(tǒng)所采用的分布處理單元均帶3個(gè)網(wǎng)絡(luò)接口，其中2個(gè)網(wǎng)口分別連接到A網(wǎng)和B網(wǎng)，實(shí)現(xiàn)各工作站點(diǎn)間的數(shù)據(jù)通信，第3個(gè)網(wǎng)口通過(guò)對(duì)等網(wǎng)數(shù)據(jù)連接子分布處理單元間（對(duì)等網(wǎng)數(shù)據(jù)現(xiàn)可選用光纖作傳輸介質(zhì)），用來(lái)傳輸主、從分布處理單元之間的備份數(shù)據(jù)；分布處理單元之間的狀態(tài)信息由串口傳輸。

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