Mitsubishi Melsec-Q Series User Manual page 464

(d) Control status of CPU module
1) An online module change can be executed when a stop error has not occurred.
Whether an online module change can be executed or not depending on the control status of the CPU
module is shown in Table12.4.
Control status
Whether online module
change can be executed
or not
*1: Including the case where a continue error has occurred in the RUN status.
2) An online module change can be continued if the control status of the CPU module is changed to the STOP/
PAUSE status during the online module change.
In either of the following cases, however, the online module change cannot be continued.
(e) Number of modules that can be changed online
The number of modules that can be changed online at one time is one for
each CPU module.
Multiple modules cannot be changed simultaneously.
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Table12.4 Whether online module change can be executed or not
RUN status*1
Can be executed Can be executed
•When the CPU module is reset
•When a stop error occurs
STOP status PAUSE status
Can be executed
At stop error
Cannot be executed