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(5) Restoring backup data
The backup data is automatically restored by the following operations.
• At power-off on of the CPU module
•At reset
Whether to restore data once after backup or per above operation is set by SM676 (Specification of restore
repeated execution).
After backup data are restored, the BAT.LED on the CPU module turns on (green) for five seconds.
If the number of device points configured in the parameter setting and the number of device points at the time of backup are
different, "RESTORE ERROR" (error code: 2220) is detected when the backup data are restored, and data restoration is not
normally completed.
(Data will be restored again when the CPU module is powered off and then on or is reset in the next time.)
Perform any of the following operations to normally complete restoring data.
• Return the status of data when the parameters are backed up.
• Delete the backup data.
• Backup data again.
(6) Deleting backup data
Select [Online] [Latch data backup operation] of GX Developer (Set the CPU module to STOP since data
cannot be deleted in the RUN status).
Also, information of special registers (SD671 to SD675) can be initialized (cleared to 0) by deleting the backup
data.
Table6.47 Status of SM676 and restoration operation
Status of SM676 at backup operation Restoration operation
SM676 is off.
Data are restored once when the CPU module is powered off
and then on or is reset after backup.
SM676 is on.
Data are restored whenever the CPU module is powered off and
then on or is reset after backup.
Data are repeatedly restored until the backup data are deleted or
the latch data are backed up next time.
Figure 6.111 Screen for deleting backup data