Mitsubishi Electric MELSEC iQ-R-R00CPU, User Manual

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37 FUNCTIONS
37.4 System Consistency Check
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Operating status
Whether the CPU modules of the control system and standby system are in the same operating status (RUN/STOP/PAUSE)
is checked.
Operation of when a mismatch is detected
If a mismatch between the operating statuses is detected, a continuation error occurs on the standby system CPU module.
The BACKUP LEDs of the redundant function modules of the control system and standby system flash because a cause of
the system switching failure has occurred.
Backup mode setting
To prevent a continuation error from being detected when the operating status is changed during operation, set the system
consistency check so that the consistency check on the operating status is not performed.
With this setting, a continuation error is not detected for the standby system CPU module even if the CPU modules of both
systems are in different statuses.
[CPU Parameter]  [Redundant System Settings]  [Redundant Behavior Setting]  [Backup Mode Setting]
Window
Displayed items
Mounting status of main base unit
The system consistency check is performed for the following items.
• Models of CPU modules
• Models and types of modules mounted on each slot
Operation of when a mismatch is detected
If a mismatch between the mounting statuses of the main base units is detected, a stop error occurs on the standby system
CPU module. If a mismatch between the mounting statuses of the main base units is detected when the CPU modules of both
systems are simultaneously turned on or reset, a stop error occurs on the control system CPU module as well.
("Simultaneously" here means that one CPU module is started up within three seconds after the other CPU module is started.)
Item Description Setting range Default
Operating Status Check Set whether to perform the consistency check for the
operating statuses of both systems or not. • Do Not Check
• Check Check