BENTLY 3500/15 127610-01超速保護
只有主從設備才能在PROFIBUS上傳輸過程數據和診斷信息。因此，主從機的狀態還包含備份從機的信息。有關詳細信息，請參閱從屬文檔。盡管備份從機沒有與主機的活動數據傳輸，但CI854/CI854A能夠監控備份從機。備份從屬設備在Livelist中可用，如果配置了冗余，則將激活監控。如果備份從屬設備發生故障，則將在主從屬設備的ExtendedStatus（擴展狀態）中設置信息“冗余從屬設備不存在”。為了在發生錯誤時允許從設備進行故障切換，CI854/CI854A具有特殊的監控功能。如果冗余從屬設備受到干擾，CI854/CI854A將等待（2*看門狗時間+1），然后指示從屬設備的連接斷開。在此期間，從設備可以執行切換并繼續正常數據交換，而不中斷通信。
Only the primary slave can transfer process data and diagnostic information on the
PROFIBUS. Therefore the status of the primary slave also contains the information
of the backup slave. Please refer to the slave documentation for the details.
Although the backup slave has no active data transmission with the master the
CI854/CI854A is able to monitor the backup slave. The backup slave is available in
the Livelist and if redundancy is configured the monitoring will be activated. If the
backup slave fails, the information "Redundant slave does not exist" will be set in
the ExtendedStatus of the primary slave.
To allow the slave a failover in case of an error the CI854/CI854A has a special
monitoring function. If the redundant slave gets disturbed the CI854/CI854A waits
for (2* watchdog time + 1) before connection down will be indicated for the slave.
During this time the slave can perform a switchover and proceed with the normal
data exchange without interrupting the communication.
