Mitsubishi Electric L02SCPU User's Manual And Reference page 190

If the backup start contact is turned on while the value in SD690 is 0
prepared), data are not backed up. If the backup start contact is on before the value in SD690 becomes 2
(Backup start preparation completed), turning off and then on the backup start contact again while the value in
SD690 is 2
H
Before backup start
ON
Backup start
setup contact
OFF
SM691
ON
(Backup start
preparation
OFF
status flag)
ON
Backup start
contact
OFF
SD690
(Backup status)
188
(Backup start preparation completed) starts backup.
Backup start setup is requested
from a programming tool or the backup
start setup contact is turned on.
Backup start prepared
1
0
(Before backup start) or 1
H
Backup start is requested
from a programming tool or the backup
start contact is turned on.
Backup start
Backup in execution
preparation completed
2
(Backup start
H
Backup completed
3
4
H