SIEMENS 6ES7422-1BL00-0AA0
SIEMENS 6ES7422-1BL00-0AA0
SIEMENS 6ES7422-1BL00-0AA0
SIEMENS 6ES7422-1BL00-0AA0
冗余分布處理單元的工作原理：兩個(gè)分布處理單元硬件配置*相同，內(nèi)部裝有相同的操作系統(tǒng)，相同的組態(tài)軟件， 相同的組態(tài)信息。在同一時(shí)刻只有1個(gè)分布處理單元通過雙機(jī)交換卡接受過程信息并進(jìn)行運(yùn)算處理，zui后產(chǎn)生控制結(jié)構(gòu)去控制過程設(shè)備，此分布處理單元稱為主分布處理單元。同時(shí)冗余分布處理單元并沒有閑置，它在每一個(gè)工作周期都通過雙機(jī)之間的光纖對(duì)主分布處理單元所接受的過程信息和運(yùn)算結(jié)果進(jìn)行實(shí)時(shí)拷貝，這樣冗余分布處理單元始終與主分布處理單元同步。冗余分布處理單元同時(shí)檢測(cè)拷貝的信息是否完整，是否在所允許的容錯(cuò)度內(nèi)。一旦信息不完整或報(bào)錯(cuò)，則說明主分布處理單元工作不正常。在這種情況下，冗余分布處理單元通過光纖將主分布處理單元旁路，同時(shí)切換為主分布處理單元繼續(xù)工作。切換時(shí)間選用zui短的運(yùn)算周期（幾十ms或更短），從而實(shí)現(xiàn)無擾動(dòng)切換。等到主分布處理單元恢復(fù)正常后，冗余分布處理單元自動(dòng)把控制權(quán)交還給主分布處理單元，轉(zhuǎn)為冗余備份狀態(tài)。
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