Mitsubishi Electric MELSEC iQ-R Series User Manual page 329

In redundant mode
This section describes the procedure of the automatic restoration using SD955 in a redundant system.
How to restore Restoration operation
Use the restoration function in Start up the CPU module in
both systems. both systems.
Start up the systems one by
one.
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 CPU modules of both systems at
the same time.)
1.
Set the restoration function to the CPU module of each system. ( Page 326 Automatic restoration using SD955)
2.
Turn on the bit 0 of SD955 (Restoration function setting) to the CPU module of each system.
3.
Power off and on or reset the CPU module of both systems at the same time.
■Use the restoration function in both systems. (Start up the systems one by one.)
1.
Set the restoration function to the CPU module of system A. ( Page 326 Automatic restoration using SD955)
2.
Turn on the bit 0 of SD955 (Restoration function setting) to the CPU module of system A.
3.
Power off and on or reset the CPU module of system A.
4.
Set the restoration function to the CPU module of system B.
5.
Turn on the bit 0 of SD955 (Restoration function setting) to the CPU module of system B.
6.
Power off and on or reset the CPU module of system B.
*1 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 326 Automatic restoration using SD955)
3.
Turn on the bit 0 of SD955 (Restoration function setting) to the 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.
Description
• Use this procedure when both systems can be powered on at the same time.
• Use the two SD memory cards used at data backup.
• After restoration, the backup data of both systems can be recovered.
• Use this procedure when both systems cannot be powered on at the same time because
the systems are far apart.
• Use the two SD memory cards used at data backup.
• 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.)
* 1
22 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
327
22.2 Restoration Function
22