Mitsubishi Electric MELSEC iQ-R Series User Manual page 201

In redundant mode
During an online change, avoid the following.
• Switching the operating status of the CPU module from STOP (PAUSE) to RUN
• System switching
• Changing the operation mode of the redundant system to backup mode
• Disconnecting tracking cables
• Powering off or resetting the CPU module of the control system or standby system
When any of the above conditions is satisfied during an online change, a file mismatch is detected in the system consistency
check or the online change fails.
■Action for when an online change has failed
If an online change has failed, take the following actions.
1.
Get ready for an online change and execute the online change with the same data as before the failure.
• If the online change succeeds, the action is completed.
• If the online change fails again, take the following actions.
2.
Verify the data in the CPU module of the control system with the programmable controller from the engineering tool, and
check whether the online change has been completed successfully.
• When the verification result is mismatched, the online change has not been completed successfully. Connect the
engineering tool to the CPU module of the control system, execute an online change only to the control system, and
proceed to step 3.
• When the verification result is matched but the program memory transfer window was not displayed at the online change,
the possible cause is that data transfer to the program memory has not been completed successfully. Batch-write files
online only to the control system, and proceed to step 3.
• When the verification result is matched and the program memory transfer window is displayed (the online change is
completed successfully) during online change, proceed to step 3.
3.
Execute the memory copy from the control system to the standby system. When the memory copy has failed, power off
and on or reset the CPU module of the standby system and execute the memory copy again. ( Page 405 Memory
Copy from Control System to Standby System)
4.
Power off and on or reset the CPU module of the standby system.
■When the program restoration information is written in the background
If the program restoration information is written by the online change using the engineering tool with version "1.045X" or
earlier and the CPU module with firmware version "15" or later, an unsupported error by the engineering tool may occur. In
this case, take either of the following actions.
• Update the version of the engineering tool.
• If the version of the engineering tool cannot be updated, set "Write with Execution Program" to the following and retry the
online change.
[Tool]  [Options]  "Convert"  "Online Program Change"  "Operational Setting"  "Write Program Restore
Information"
■Writing data to the CPU module in a redundant system with redundant extension base unit
Data cannot be written to the programmable controller while its CPU module is running or while connecting to a module on the
extension base unit. Otherwise, an error occurs.
14 WRITING DATA TO THE CPU MODULE
14.3 Precautions
14
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