Replacing A Cpu Module - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Replacing a CPU module

The following describes the procedure for replacing the CPU module.
The replacement procedure differs depending on whether the automatic memory copy function is enabled or disabled. (
Page 470 Automatic memory copy)
When the automatic memory copy function is enabled
1.
Check the operation mode.
Check the BACKUP LED of the redundant function module in the control system to check if the CPU module in the control
system is in the backup mode.
• The BACKUP LED of the redundant function module in the control system is on or flashes.
2.
Check the system of the replacement target CPU module.
Check the CTRL LED and SBY LED of the redundant function module in the system of the replacement target CPU module
for the following. The target module is in the standby system in this case.
• The CTRL LED is off and the SBY LED flashes on the redundant function module of the system of the replacement target
CPU module.
3.
Power 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.
Replace 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.
5.
Change the switch status 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.
Power on the standby system.
Power on the standby system.
7.
Memory copy from control system to standby system
The memory is automatically copied. When the memory copy is completed, the MEMORY COPY LEDs of the redundant
function modules of both systems turn off. Then, the CPU module in the standby system is automatically reset and restarted.
( Page 470 Automatic memory copy)
The BACKUP LED of the redundant function module in the control system turns on. (The control system will not wait for the
start-up of the other system.)
30 MAINTENANCE AND INSPECTION FOR A REDUNDANT SYSTEM
30.1 Module Replacement in the Redundant System
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