User Manual PLC-3 BACKUP CONC(OR.DU1 Owner's manual
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
1775KA modules.