Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Uživatelský manuál Strana 15

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Choosing a Backup Configuration
Chapter 1
1-8
Switchover
Method:
Attributes:
Manual
Switchover
 When the primary processor faults, the system shuts down as though no
backup system were available.
 Operator intervention is required at switchover.
 Control of the process is lost until switchover occurs.
 Quickly resume control of a process following a fault in the primary
processor.
 Easy to transfer between primary and backup processor.
 Manual switchovers do not guard against unexpected shutdowns as well as
automatic switchovers do.
 We suggest this method for applications using multidrop modems with
1775KA modules.
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