Automatic Restoration Using Sd955 - Mitsubishi Electric MELSEC iQ-R Series User Manual

Automatic restoration using SD955

Backup data is automatically restored when the CPU module is powered on or is reset.
Initialization at the automatic restoration
Set whether or not to initialize drives other than the SD memory card at execution of the automatic restoration with the bit 1 of
SD955 (Restoration function setting).
This setting is enabled only when SD954 (Restoration target data setting) is set to 0 (All target data).
Bit 1 of SD955
Off
On
Operating procedure
1.
Set the data to restore in SD954.
2.
Set a restoration target folder in the areas from SD956 (Restoration target date folder setting) to SD958 (Restoration
target number folder setting). (These settings are not required when the bit 13 of SD955 is on.)
3.
Set values to the bit 1 and bits from 13 to 15 of SD955.
4.
Turn on the bit 0 of SD955.
5.
Power off and on or reset the CPU module.
If the restoration processing is completed with an error and SM959 (CPU module data restoration error check flag) turns on,
check SD959 (Restoration error cause), take actions, and then restore the data again as required.
• Since the special register set for the automatic restoration is a latch area, setting data is held.
• SD955 holds its setting even after the CPU module is powered off and on or is reset. Thus, if the CPU
module is powered off and on or is reset while the bit 0 of SD955 is on, the automatic restoration is
executed again. Not to perform the automatic restoration when the CPU module is powered off and on or is
reset next time, turn off the bit 0 of SD955 after a restoration is completed and then power off and on or
reset the CPU module.
22 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
326
22.2 Restoration Function
Restoration target data setting
Not initialized
Initialized