在所有的情況下，數(shù)據(jù)還是在每個周期內(nèi)通過冗余連接被傳輸并且在每個同步點(diǎn)同步。SVC_ REQ#43命令的作用是使傳輸不被復(fù)制到備份單元的內(nèi)存里。警告當(dāng)SVC REQ#43起作用時，備份單元還繼續(xù)執(zhí)行控制，當(dāng)錯誤發(fā)生和切換控制的單元時可以繼續(xù)接管系統(tǒng)。這時如果切換發(fā)生，可能會發(fā)生輸出突變的情況，因為兩個單元可能產(chǎn)生不同的輸出結(jié)果。

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