Mitsubishi L02CPU User Manual page 174

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
ON
Backup start
setup contact
OFF
SM691
ON
(Backup start
preparation
OFF
status flag)
ON
Backup start
contact
OFF
SD690
(Backup status)
172
(Backup start preparation completed) starts backup.
H
Backup start setup is requested
from a programming tool or the backup
startsetup contact is turned on.
Before backup start Backup start prepared
0
Backup start is requested
from a programming tool or the backup
start contact is turned on.
Backup start
preparation completed
1 2
(Before backup start) or 1
H
Backup in execution Backup completed
3
4
(Backup start
H
H