SIEMENS 6ES7421-1BL01-0AA0
SIEMENS 6ES7421-1BL01-0AA0
SIEMENS 6ES7421-1BL01-0AA0
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DCS廠家的產(chǎn)品中是不同的。這兩種方式各有優(yōu)缺點。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。在投入運行時，若出現(xiàn)故障，兩分布處理單元之間能實現(xiàn)無擾動切換，保證系統(tǒng)的正常運行。
本系統(tǒng)所采用的分布處理單元均帶3個網(wǎng)絡(luò)接口，其中2個網(wǎng)口分別連接到A網(wǎng)和B網(wǎng)，實現(xiàn)各工作站點間的數(shù)據(jù)通信，第3個網(wǎng)口通過對等網(wǎng)數(shù)據(jù)連接子分布處理單元間（對等網(wǎng)數(shù)據(jù)現(xiàn)可選用光纖作傳輸介質(zhì)），用來傳輸主、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。
廈門仲鑫航自動化設(shè)備有限公司
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