Mitsubishi Electric MELSEC iQ-R Series User Manual page 331

In redundant mode
This section describes the procedure of the automatic restoration with the SD CARD OFF button in a redundant system.
How to restore
Use the restoration function in both
systems.
After restoring the data of one
system, copy the data to the other
system by memory copy.
■Use the restoration function in both systems. (Start up the systems one by one.)
1.
Power on or reset the CPU module while pressing the SD CARD OFF button of the CPU module of system A.
2.
Power on or reset the CPU module while pressing the SD CARD OFF button of the CPU module of system B.
*1 Release the SD CARD OFF button within 10 seconds after the READY LED begins to flash. If the switch is pressed more than 10
seconds, restoration may fail.
*2 The system A that starts up earlier will wait for the start-up of the other system.
■After restoring the data of one system, copy the data to the other system by memory copy.
1.
Enable the following settings in "Redundant Behavior Setting" of the CPU parameter beforehand: "Auto Memory Copy
Setting" and either or both of the control system start-up settings under "Control/Standby System Start-up Setting".
[CPU Parameter]  [Redundant System Settings]  [Redundant Behavior Setting]
2.
Set the restoration function to the CPU module of the own system. ( Page 328 Automatic restoration with the SD
CARD OFF button)
3.
Power on or reset the CPU module while pressing the SD CARD OFF button of CPU module of the own system.
4.
In a redundant system without extension base units, start up the CPU module of the own system as the control system.
In a redundant system with redundant extension base unit, the system does not wait for the start-up of the other system
and is started up as the control system.
5.
Check that the SD memory card is inserted into the CPU module of the other system, and then power off and on or reset
the module.
*1 Release the SD CARD OFF button within 10 seconds after the READY LED begins to flash. If the switch is pressed more than 10
seconds, restoration may fail.
Restoration operation Description
Start up the systems one by • Use the two SD memory cards used at data backup.
one. • After restoration, the backup data of both systems can be recovered.

• Use one of the SD memory cards used at data backup.
• The target data for memory copy is copied from the CPU module of the control
system to the CPU module of the standby system. (Data that is not target for memory
copy will not be the data at data backup.)
• In "Redundant Behavior Setting" of the CPU parameter, set "Enable" to "Auto Memory
Copy Setting" and enable either or both of the control system start-up settings in
"Control/Standby System Start-up Setting" beforehand. (The memory copy can be
executed after the module starts as a control system.)
22 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
* 1*2
* 1
* 1
329
22.2 Restoration Function
22