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3) Operation of contacts
Operations of the backup start setup contact, backup start contact, SM691 (Backup start preparation status
flag), and SD690 (Backup status) at backup are shown in Figure 6.116.
GX Developer or the backup start
Before backup start
ON
Backup start
setup contact
OFF
SM691
ON
(Backup start
preparation status
OFF
flag)
ON
Backup start
OFF
contact
SD690
(Backup status)
If the backup start contact is turned on while the value in SD690 is 0
start prepared), data are not backed up.
If the backup start contact is on before the value in SD690 becomes 2
turning off and then on the backup start contact again while the value in SD690 is 2
preparation completed) starts backup.
Backup start setup request from
setup contact is turned on.
Backup start prepared
1
0
Figure 6.116 Operation of contacts
Backup start request from
GX Developer or the backup
start contact is turned on.
Backup start
preparation completed Backup in execution
2
3
(Before backup start) or 1
H
(Backup start preparation completed),
H
CHAPTER6 FUNCTIONS
Backup completed
4
(Backup
H
(Backup start
H
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