Switchover Conditions
The 1747-BSN module transfers control from the primary to the secondary
processor (switchover) if one of the following fault conditions occurs in the
primary system:
• power failure
• major fault in the processor
• 1747-BSN module fault
• primary processor mode change from Run to Program
Note: In order for switchover to occur, both primary and
secondary modules must be working without faults prior
to the event that triggers the switchover.
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