Mitsubishi Electric MELSEC iQ-R Series - Operating Status; Modules on the Main Base Unit

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26 REDUNDANT FUNCTION
26.5 System Consistency Check
Operating status
Whether the operating status (RUN/STOP/PAUSE) of the CPU module is the same between the control system and the
standby system is checked.
When a mismatch is detected
A continuation error occurs in the CPU module of the standby system. In addition, the BACKUP LED of the redundant function
module flashes in both systems because a system switching disable cause exists.
Backup mode setting
To not to generate a continuation error when the operating status is switched during operation, checking the operating status
can be disabled.
When disabled, a continuation error will not occur in the CPU module of the standby system even when the operating status
of the CPU module differs in the two systems.
[CPU Parameter]  [Redundant System Settings]  [Redundant Behavior Setting]
Window
Displayed items
Modules on the main base unit
Whether the following items are the same between the control system and the standby system is checked.
• Model of the CPU module
• Model and type of modules mounted on each slot on the main base unit
*1
• Firmware version supporting functions added and changed by the upgrade and its settings
*2
*1 For a slot set to be empty in the module status setting under the I/O assignment setting for system parameters, no error occurs even if
the module model names are not the same.
*2 For functions added and changed by the upgrade and supported firmware versions, refer to the following.
Page 747 Added and Enhanced Functions
When a mismatch is detected
A stop error occurs in the CPU module of the standby system. If a stop error is detected when both systems are
simultaneously powered on or reset, a stop error occurs in the CPU module of the control system as well.
("Simultaneously" here means when one system is started up within three seconds of the other.)
Item Description Setting range Default
Backup Mode
Setting
Set whether to check the operating status consistency
between the two systems or not when the redundant
system is in backup mode.
• Do Not Check Operating Status
Consistency
• Check Operating Status
Consistency
Check Operating Status
Consistency