ABB PFXA401 3BSE024388R3控制单元
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自动切换到备用CPU在冗余配置中，如果主CPU处于同步状态（双LED亮起），则在以下情况下会自动切换到备份CPU：•主CPU内存错误。•主CPU中的其他硬件错误，导致CPU崩溃。•控制网络上的严重通信错误，即主CPU中的两个网络端口丢失。•ModuleBus上的严重通信错误（如果ModuleBus是硬件配置的一部分），即主CPU中的群集丢失。请注意，如果ModuleBus上出现严重通信错误的备份CPU将被拒绝（如果ModuleBus是硬件配置的一部分），并且只要错误仍然存在，就永远不会达到同步状态。验证AC 800M操作是否符合要求在启动后，确认AC 800M控制器和所有相关单元正常运行，请参阅第185页的表23。验证单个CPU检查每个LED指示灯的状态，并将其与表中列出的标准进行比较。如果状态不是列出的状态，请参阅第204页的故障查找程序。表23。AC 800M控制器——系统运行合格验证
Automatic Switch-Over to Backup CPU In a redundant configuration an automatic switch-over from the Primary CPU to the Backup CPU occurs in the following situations, provided they are in synchronized state (DUAL LED is lit): • Memory error in the Primary CPU. • Other HW-error in the Primary CPU, which causes CPU crash. • Severe communication errors on the Control network, that is, loss of both network ports in the Primary CPU. • Severe communication errors on the ModuleBus (if ModuleBus is part of the HW configuration) that is, loss of clusters in the Primary CPU. Note that a Backup CPU with severe communication errors on the ModuleBus will be rejected (if ModuleBus is part of the HW configuration) and synchronized state will never be reached as long as error remains.Verification of Satisfactory AC 800M Operation To affirm, following start-up, that the AC 800M Controller and all associated units are operating correctly, see Table 23 on page 185. Verification of Single CPU Check the status of each LED indicator and compare it against the criteria listed in the table. If the status is other than that listed, see Fault-Finding Procedures on page 204. Table 23. AC 800M Controller – Verification of Satisfactory System Operation
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