GE 8601-FT-NI
冗余內(nèi)存交換單元硬件故障
奇偶故障或者VME總線故障被認(rèn)為是RMX模塊的硬件故障。發(fā)生此類故障時(shí)會執(zhí)行下列操作:
■失去選項(xiàng)模塊或者冗余連接硬件故障會被被記錄到PLC故障列表中。
■倆個(gè)單元都記錄冗余連接通訊故障
■所有RMX模塊的指燈關(guān)斷
■置位關(guān)聯(lián)的模塊故障位置參數(shù)(例如SLOT__00XX故障接點(diǎn)被置位，其中XX是RMX模塊中的槽號。
■通訊冗余連接不再使用。如果其它連接仍然在使用，那條連接會用來作其它的數(shù)據(jù)傳輸，單元仍然處于同步狀態(tài)。如果其它冗余連接都不可用并且每個(gè)單元都在run模式下，那個(gè)單元當(dāng)做非同步的激活單元使用。電源必須被重新上電來使故障的RMX模塊重新投入使用。
冗余連接通訊失敗
下面的錯(cuò)誤會被報(bào)告為冗余連接失敗:
■另一個(gè)單元掉電或者發(fā)生錯(cuò)誤導(dǎo)致通訊失敗。
1倆個(gè)RMX模塊之間的其中一條或者倆條電纜都發(fā)生錯(cuò)誤或者斷線。
■連接倆個(gè)RMX模塊的光纖發(fā)生錯(cuò)誤導(dǎo)致網(wǎng)絡(luò)錯(cuò)誤。(這包括數(shù)據(jù)校驗(yàn)不匹配，協(xié)議錯(cuò)誤和錯(cuò)誤的數(shù)據(jù)包)。
另一個(gè)CPU為在失敗等待時(shí)間內(nèi)達(dá)到下一一個(gè)同步點(diǎn)。
發(fā)生冗余連接通訊故障時(shí)會執(zhí)行下面的動作:
1.冗余連接通訊失敗或者失敗等待超時(shí)故障會被記錄在倆個(gè)單元中的PLC故障列表中。
2.倆個(gè)RMX模塊的連接正常指示燈熄滅。
3.置位關(guān)聯(lián)的模塊故障位置參數(shù)(例如SLOT_ _00XX故障接點(diǎn)被置位，其中XX是RMX模塊中的槽號。)
4.通訊冗余連接不再使用。如果另-條連接還在運(yùn)行，那條連接會用來作其它的數(shù)據(jù)傳輸，單元仍然處于同步狀態(tài)。如果其它冗余連接都不可用并且每個(gè)單元都在run模式下，那個(gè)單元當(dāng)做非同步的激活單元使用。
如果RMX模塊的OK指示燈還處于ON狀態(tài)，連接可以通過重新上電一次或者使用硬件配置來保存。如果其中有OK指示燈變成OFF，必須重新上電來保存配置到RMX模塊。
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