172 Rockwell Automation Publication 1756-UM535D-EN-P - November 2012
Chapter 7 Program the Redundant Controller
Configure the MSG Instruction
Use the MSG configuration settings that correspond to the command you intend
to issue to the redundancy modules.
Initiate a Switchover
To initiate a switchover, use the MSG instruction parameters listed in this table.
If you need to See page
Initiate a Switchover 172
Disqualify the Secondary Chassis 174
Synchronize the Secondary Chassis 174
Set the Redundancy Module Date and Time 175
Table 29 - MSG Instruction to Initiate a Switchover
In this tab Edit this element To use this value
Configuration Message Type CIP Generic
Service Type Custom
Service Code 4e
Class bf
Instance 1
Attribute None - no value needed
Source Element INT tag with a value of 1
Source Length 2
Destination Element None - no value needed.
Communication Path Browse for the path to the 1756-RM or
1756-RMXT redundancy module.
Connected box Leave the Connected checkbox unchecked.
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