Replacing The Intelligent Function Module; Replacing The Main Base Unit - Mitsubishi Electric MELSEC iQ-R Series User Manual

Replacing the intelligent function module

The following describes the procedure for replacing the intelligent function module on the main base unit 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.
To replace this module without turning the power off while the system is operating, use the online module change function.
( MELSEC iQ-R Online Module Change Manual)
1.
Checking the system of the replacement target module
Check the CTRL LED and SBY LED of the redundant function module in the system to which the replacement target module
belongs, and confirm that the replacement target module is in 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.
Replace the intelligent function module in the standby system
Disconnect the cables such as communication cables and wires connected to the intelligent function module in the standby
system. Replace the intelligent function module with a new intelligent function module whose model is the same as that of the
intelligent function module in the control system.
4.
Powering 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. (The control system no longer waits for the start-up of the other system.)
5.
Executing the module diagnostics for the standby system
Check the error information of the module diagnostics and confirm that no error has occurred. In addition, when replacing the
network module, check the network status with the network diagnostics.

Replacing the main base unit

The following describes the procedure for replacing the main base unit 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.
1.
Checking the system of the replacement target base unit
Check the CTRL LED and SBY LED of the redundant function module in the system to which the replacement target base unit
belongs, and confirm that the replacement target module is in 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 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.
Powering 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. (The control system no longer waits for the start-up of the other system.)
5.
Checking the modules for errors
Check that no error has occurred in the CPU module or the redundant function module of the standby system. If the ERROR
LED of either of the modules is on or flashing, identify the error and eliminate the error cause.
35 MAINTENANCE AND INSPECTION OF A REDUNDANT SYSTEM
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35.1 Module Replacement in a Redundant System