Online Change - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

28.10

Online Change

When the online change (ladder block) is performed on the CPU module in one system in backup mode, the change is also
reflected on the CPU module in the other system.
In separate mode, only the ladder block of the CPU module in the system specified in the transfer setup of the engineering
tool is changed.
Precautions
During an online change, avoid the following conditions.
• Changing the operating status of the CPU module from STOP (PAUSE) to RUN
• System switching
• Operation mode switching (switching to the backup mode)
• The tracking cable has been removed.
• The control system or standby system CPU module has been off or reset.
When either 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 control system CPU module 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 control system CPU module, 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 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 standby system CPU module and execute the memory copy again. ( Page 468 Memory Copy
from Control System to Standby System)
4.
Power off and on or reset the standby system CPU module.
■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.
[Tool]  [Options]  "Convert"  "Online Program Change"  "Operational Setting"  "Write Program Restore
Information"
28 FUNCTIONS
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28.10 Online Change
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