Mitsubishi Electric MELSEC iQ-R Series User Manual page 545

When the auto memory copy setting is disabled
1.
Checking the system of the replacement target CPU module
Check the CTRL LED and SBY LED of the redundant function module in the system to which the replacement target CPU
module belongs, and confirm that the replacement target CPU module is set as the standby system.
• The CTRL LED is off and the SBY LED is on.
2.
Powering off the standby system
Power off the standby system. When the standby system is powered off, the BACKUP LED of the redundant function module
in the control system flashes. (The control system enters the wait state for the start-up of the other system.)
3.
Replacing the CPU module in the standby system
Replace the CPU module in the standby system with a new CPU module whose model is the same as that of the CPU module
in the control system. If an SD memory card or an extended SRAM cassette has been inserted to the replacement target CPU
module, insert it to the new CPU module.
When using functions added or changed by the upgrade, replace with a CPU module with a firmware version that supports the
functions used. ( Page 747 Added and Enhanced Functions)
4.
Changing the switch position of the CPU module in the standby system
Set the RUN/STOP/RESET switch of the CPU module in the standby system to the RUN position.
5.
Powering on the standby system
Power on the standby system.
6.
Executing the memory copy from the control system to the standby system
Execute the memory copy using the engineering tool or the special relay and special register. ( Page 408 Memory copy
using the engineering tool,  Page 409 Memory copy using the special relay and special register)
Upon completion of the memory copy function, the MEMORY COPY LED of the redundant function module in the control
system turns off and that in the standby system turns on.
7.
Restarting the standby system
Restart the standby system. When the standby system is powered on, the BACKUP LED of the redundant function module in
the control system turns on. (The control system no longer waits for the start-up of the other system.)
35 MAINTENANCE AND INSPECTION OF A REDUNDANT SYSTEM
35.1 Module Replacement in a Redundant System
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