如果交换的信息必须被两两个单元都看到,交换数据需要传递的数据应该在从激活单元到备用单元的输,入传递中进行。这个传输会在接收到egd信息后的第一-个扫描周期内被传送。交换的变量必须放在%I或%AI内存中和输入数据–起被传递。如果CPU检测到了内部故障并且进行了可控制的关断,它会记录一个故障,切换到STOP/FAULT状态,并通知另一个CPU。如果检测到激活单元的错误,到下-一个扫描周期来之前不会进行切换。
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