Replacing The Redundant Function Module; Replacing The I/O Module - Mitsubishi Electric MELSEC iQ-R Series User Manual

Replacing the redundant function module

The following describes the procedure for replacing the redundant function 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.
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.
Replacing the redundant function module in the standby system
Replace the redundant function module in the standby 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.

Replacing the I/O module

The following describes the procedure for replacing the I/O 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.
Replacing the I/O module in the standby system
Replace the I/O module in the standby system with a new I/O module whose model is the same as that of the I/O 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.)
35 MAINTENANCE AND INSPECTION OF A REDUNDANT SYSTEM
35.1 Module Replacement in a Redundant System
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