Mitsubishi Electric MELSEC iQ-R Series User Manual page 374

Changing the operation mode to the backup mode
The operation mode can be changed to the backup mode only in the communication path where the operation mode was
changed to the separate mode.
This section describes how to change the operation mode to the backup mode.
1.
Set the CPU modules of the control system and the standby system to have the same file configuration and operating
status. (To prevent an error from occurring after the operation mode is changed from the separate mode to the backup
mode and the system consistency check is restarted.)
2.
Connect the engineering tool to the CPU module of the control system.
3.
Open the "Redundant Operation" window of the engineering tool.
[Online]  [Redundant PLC Operation]  [Redundant Operation]
4.
Select "Backup Mode" in "Change the Operation", and click the [Execute] button. The BACKUP LED of the redundant
function module turns on.
5.
When the tracking trigger has been turned off at the mode switching to the separate mode, turn on the tracking trigger.
( Page 394 Tracking trigger)
• When the CPU modules of both systems are simultaneously powered off and on or reset, the systems start
up in backup mode.
• Even in a different communication path, when the CPU module of the control system has been powered off
or reset in separate mode, the operation mode can be changed from the separate mode to the backup
mode using the engineering tool.
• When the operation mode is changed to the separate mode, the CPU module of the standby system enters
the wait state for the RUN-transition instruction (the PROGRAM RUN LED flashes). If the operation mode is
changed to the backup mode in this state, the CPU module enters the RUN state (the PROGRAM RUN
LED stops flashing).
26 REDUNDANT FUNCTION
372
26.1 Operation Mode Change