Mitsubishi Electric MELSEC iQ-R-R00CPU, User Manual

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40 MAINTENANCE AND INSPECTION FOR A SYSTEM USING SIL2 PROCESS CPU
40.1 Module Replacement in a System Using the SIL2 Process CPU
Replacing a CPU module and SIL2 function module
This section describes the procedure for replacing a CPU module and SIL2 function module.
1.
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 is on on the redundant function module of the system of the replacement target
CPU module.
2.
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.
3.
Replace the CPU module and SIL2 function module in the standby system.
Replace the CPU module and SIL2 function module in the standby system with a new CPU module and SIL2 function module
with the same models as those of the CPU module and SIL2 function module in the control system. The pair versions of the
CPU module and SIL2 function must be the same. 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.
4.
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.
5.
Power on the standby system.
Power on the standby system.
6.
Execute the memory copy from the control system to the standby system.
Execute the memory copy using the engineering tool. (

Page 637 Memory Copy from Control System to Standby System)
When the memory copy is completed, the MEMORY COPY LED of the redundant function module in the control system turns
off and that in the standby system turns on.
7.
Restart 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.
8.
Check the safety operation mode.
Change the safety operation mode of the CPU module in the standby system to SAFETY MODE. (

Page 655 Switching
Safety Operation Mode)
Replacing a power supply module
This section describes the procedure for replacing the power supply module.
1.
Check the system of the replacement target power supply module.
Check the CTRL LED and SBY LED of the redundant function module in the system of the replacement target module for the
following. The target module is in the standby system in this case.
• The CTRL LED is off and the SBY LED is on on the redundant function module of the system of the replacement target
CPU module.
2.
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.
3.
Replace the power supply module in the standby system.
Replace the power supply module in the standby system.
4.
Power on the standby system.
Check if wiring to the power supply module and the power supply voltage are correct, and power on the standby system.
When the standby system is powered on, the BACKUP LED of the redundant function module in the control system turns on.