Replacing A Main Base Unit - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Replacing a main base unit

This section describes the procedure for replacing the main base unit.
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 main base unit in the standby system.
Replace the main base unit in the standby system with a new main base unit whose model is the same as that of the main
base unit in the control system. When mounting modules to the new base unit, mount each module to the slots of the unit in
the same order as that of the base unit of the control system.
4.
Power on the standby system.
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.
5.
Check the modules for errors.
Check that no error has occurred on the CPU module or redundant function module in the standby system. If the ERROR LED
of either of the modules is on or flashes, check the cause of an error and eliminate the error cause.
40 MAINTENANCE AND INSPECTION FOR A SYSTEM USING SIL2 PROCESS CPU
700
40.1 Module Replacement in a System Using the SIL2 Process CPU