Choosing a backup configuration chapter 1 – Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 User Manual
Page 15
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Choosing a Backup Configuration
Chapter 1
1-8
Switchover
Method:
Attributes:
Manual
Switchover
Ć When the primary processor faults, the system shuts down as though no
backup system were available.
Ć Operator intervention is required at switchover.
Ć Control of the process is lost until switchover occurs.
Ć Quickly resume control of a process following a fault in the primary
processor.
Ć Easy to transfer between primary and backup processor.
Ć Manual switchovers do not guard against unexpected shutdowns as well as
automatic switchovers do.
Ć We suggest this method for applications using multidrop modems with
1775ĆKA modules.
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