Operating Status; Mounting Status Of Main Base Unit; Sd Memory Card - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

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 even if the CPU modules of both systems are in different statuses.
[CPU Parameter]  [Redundant System Settings]  [Redundant Behavior Setting]
Window
Displayed items
Item
Backup Mode Setting

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.)

SD memory card

The system consistency check is performed to check the installation of the SD memory cards and the status of the write
protect switch. The SD memory card type or capacity is not checked.
The system checks if the SD memory card is inserted while the control system is running even in the case
only the standby system is turned off and on or reset. When an SD memory card is used, removing it more
than necessary is not recommended.
28 FUNCTIONS
478
28.5 System Consistency Check
Description
Set whether to perform the consistency check on the
operating statuses of both systems or not in backup
mode.
Setting range
• Do Not Check Operating Status
Consistency
• Check Operating Status
Consistency
Default
Check Operating Status
Consistency