SIEMENS 6ES7952-1AK00-0AA0
SIEMENS 6ES7952-1AK00-0AA0
SIEMENS 6ES7952-1AK00-0AA0
SIEMENS 6ES7952-1AK00-0AA0
為提高數(shù)據(jù)通信的整體可靠性和容錯性，本DCS控制系統(tǒng)也采用環(huán)形的網(wǎng)絡(luò)拓補結(jié)構(gòu)。但是由于環(huán)形網(wǎng)本身固有的缺點是節(jié)點故障引起全網(wǎng)故障，因此數(shù)據(jù)通信鏈路的冗余技術(shù)應(yīng)運而生。為了保證2層網(wǎng)絡(luò)的順利工作，2個網(wǎng)絡(luò)都采用1∶1的冗余設(shè)置。分布處理單元檢測到主網(wǎng)出現(xiàn)故障時，自動放棄從主網(wǎng)的端口通信，同時啟用冗余網(wǎng)的端口，將數(shù)據(jù)轉(zhuǎn)由冗余網(wǎng)發(fā)送 和接受。此時冗余網(wǎng)進入數(shù)據(jù)通信狀態(tài)，主網(wǎng)及時進行修補。雙環(huán)網(wǎng)技術(shù)實現(xiàn)了傳輸媒介的冗余，在TurboRing的基礎(chǔ)上進一步提高了系統(tǒng)的可靠性。但雙環(huán)網(wǎng)的管理和切換都比較復(fù)雜，本系統(tǒng)采用了一種簡單的方法。
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