Replacing The Cpu Module - Mitsubishi Electric MELSEC iQ-R Series User Manual

Replacing the CPU module

The following describes the procedure for replacing the CPU module of the standby system after turning the power off while
the redundant system is operating. When the replacement target is in the control system, turn on SM1646 (System switching
by a user) in advance and switch the system to the standby system.
The replacement procedure differs depending on whether the automatic memory copy function is enabled or disabled. (
Page 407 Auto memory copy)
When the auto memory copy setting is enabled
1.
Checking the operation mode
Check the BACKUP LED of the redundant function module in the control system, and confirm that the CPU module of the
control system is in backup mode.
• The BACKUP LED is on or flashing.
2.
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.
3.
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.
4.
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)
5.
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.
6.
Powering on the standby system
Power on the standby system.
7.
Executing the memory copy from the control system to the standby system
The memory copy function automatically starts. Upon completion of the memory copy function, the MEMORY COPY LED of
the redundant function module turns off in both systems. Then, the CPU module in the standby system is automatically reset
and restarted. ( Page 407 Auto memory copy)
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
542
35.1 Module Replacement in a Redundant System