Sd Memory Card; Safety Operation Mode - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

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.
Operation of when a mismatch is detected
If a mismatch of the installation of the SD memory cards or the status of the write protect switch is detected, a stop error
occurs on the standby system CPU module. If a mismatch 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.

Safety operation mode

Whether the safety operation modes (SAFETY MODE/TEST MODE) of the CPU modules of both systems are the same is
checked.
Operation of when a mismatch is detected
If a mismatch is detected between the safety operation modes, 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
When "Do Not Check" is set in "Operating Status Check", a continuation error is not detected for the standby system CPU
module even if the safety operation modes are different between the both systems.
[CPU Parameter]  [Redundant System Settings]  [Redundant Behavior Setting]  [Backup Mode Setting]
Window
Displayed items
Item
Safety Operation Mode Check
37 FUNCTIONS
646
37.4 System Consistency Check
Description
Set whether to perform the consistency check for the
safety operation modes of both systems or not.
Setting range
• Do Not Check
• Check
Default
Check