Mitsubishi Electric Q26UD(E)HCPU User Manual page 272

(4) Online module change procedure
The following explains the online module change procedure of the I/O module.
For the online module change procedure of the intelligent function module, refer to the manual of the used
intelligent function module.
● It is recommended to turn off the output (Y) from the output module/I/O combined module to be changed online before it
is changed.
● When making an online module change for the Redundant CPU, specify "No settings have been made (Default)",
"System A" or "System B" as the target system in the "transfer setup" by a programming tool.
Do not specify the "Control system" or "Standby system" as the target system.
If the "Control system" or "Standby system" is specified in the transfer setup, the following error dialog appears at
execution of an online module change.
When the following error dialog is displayed, change the target system to "No settings have been made (Default)",
"System A" or "System B", and then perform an online module change.
● When executing online module change for the module mounted on the extension base unit in the Redundant CPU,
access cannot be made to a module mounted on the extension base unit from the standby system. Set [Transfer setup] in
a programming tool, checking that the transfer target Redundant CPU module is the control system.
1.
Online module change can be performed by the following operation.
[Diagnostics]
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[Online Module Change]