Standby CPU Online Application Modifications with Application Mismatch
Original instructions
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Procedure
To make online modifications to an application program in the Standby PLC, follow these steps:
Step
Action
1
Verify that the Primary and Standby PLCs are in Run Primary CPU and Run Standby CPU modes.
2
Connect Control Expert to the Primary CPU.
3
Set the Command Register system bit %SW60.3 to 1.
4
Connect Control Expert to the Standby CPU controller.
5
Modify online the application program.
6
Perform a Rebuild All Project.
NOTE: If adding/removing modules with CCOTF, use Build Changes.
7
Verify that the Primary and Standby PLCs are in Run Primary CPU and Run Standby CPU modes.
8
Perform a Switchover.
Note: Standby CPU changes to Primary CPU.
9
Perform an application transfer to new Standby CPU.
10
Set the Command Register system bit %SW60.3 to 0.
Note: The Command Register system bit is then returned to 0 from 1.
NOTE: For more details, refer to Application Mismatch.