如果交換的信息必須被兩兩個(gè)單元都看到，交換數(shù)據(jù)需要傳遞的數(shù)據(jù)應(yīng)該在從激活單元到備用單元的輸，入傳遞中進(jìn)行。這個(gè)傳輸會(huì)在接收到egd信息后的第一-個(gè)掃描周期內(nèi)被傳送。交換的變量必須放在%I或%AI內(nèi)存中和輸入數(shù)據(jù)–起被傳遞。如果CPU檢測(cè)到了內(nèi)部故障并且進(jìn)行了可控制的關(guān)斷，它會(huì)記錄一個(gè)故障，切換到STOP/FAULT狀態(tài)，并通知另一個(gè)CPU。如果檢測(cè)到激活單元的錯(cuò)誤，到下-一個(gè)掃描周期來(lái)之前不會(huì)進(jìn)行切換。

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