Replacing The Extension Cable Between The Main Base Unit And Extension Base Unit; Replacing The Extension Cable Between Extension Base Units - Mitsubishi Electric MELSEC iQ-R Series User Manual

Replacing the extension cable between the main base unit and
extension base unit
The following describes the procedure for replacing the extension cable between the main base unit of the standby system
and the extension base unit after turning the power off while the redundant system is operating. When replacing the extension
cable between the main base unit of the control system and the extension base unit, 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 cable
Check the CTRL LED and SBY LED of the redundant function module in the system to which the replacement target cable
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.
3.
Replacing the extension cable between the main base unit and the extension base unit
Replace the extension cable that connects the main base unit of the standby system and the extension base unit.
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.
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 extension cable between extension base units

Only the extension cable on the inactive side can be replaced. ( Page 548 Replacement/Addition of Extension Cables
(Online))
If the extension cable on the active side is disconnected, system switching occurs, and the cable cannot be replaced.
35 MAINTENANCE AND INSPECTION OF A REDUNDANT SYSTEM
35.1 Module Replacement in a Redundant System
35
547