Will a BMENOC0321 that stops operating cause a switch over in a Hot Standby system?
Issue
It is not documented if a BMENOC0321 that stops operating will cause a switch over in a Hot Standby system.
Product Line
M580 Hot Standby
BMENOC0321
Resolution
The BMENOC0321 behavior in an M580 Hot Standby is similar to that of the BMENOC0301/0311 communication modules. The statement highlighted below from page 18 in the M580 Hot Standby System Planning Guide, (part number NHA58880.07), also applies to the BMENOC0321.
Events that Do Not Cause Switchover
These events DO NOT cause a switchover:
It is not documented if a BMENOC0321 that stops operating will cause a switch over in a Hot Standby system.
Product Line
M580 Hot Standby
BMENOC0321
Resolution
The BMENOC0321 behavior in an M580 Hot Standby is similar to that of the BMENOC0301/0311 communication modules. The statement highlighted below from page 18 in the M580 Hot Standby System Planning Guide, (part number NHA58880.07), also applies to the BMENOC0321.
Events that Do Not Cause Switchover
These events DO NOT cause a switchover:
- simultaneous interruption of communication with all RIO drops by both the primary and the standby PAC
- partial interruption of communication with the RIO drops by the primary PAC
- a Modbus connection break
- overload broadcast traffic generated by a peer (for example, SCADA, or another PAC)
- a BMENOC0301/11 module that stops operating
- removal of an SD memory card (see page 42)
- for a Hot Standby safety system, if the primary PAC is partially (either the SAFE program or the PROCESS program) in the HALT state, and not all of the tasks in the standby PAC are in RUN
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