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CHAPTER6 FUNCTIONS
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6.30 CPU Module Change Function with Memory Card
6.30.1 Backup function to memory card
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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.
If the backup start contact is turned on while the value in SD690 is 0
H
(Before backup start) or 1
H
(Backup
start prepared), data are not backed up.
If the backup start contact is on before the value in SD690 becomes 2
H
(Backup start preparation completed),
turning off and then on the backup start contact again while the value in SD690 is 2
H
(Backup start
preparation completed) starts backup.
Figure 6.116 Operation of contacts
ON
OFF
OFF
ON
0
12
3
4
OFF
ON
Backup start
setup contact
SM691
(Backup start
preparation status
flag)
Backup start
contact
SD690
(Backup status)
Backup start setup request from
GX Developer or the backup start
setup contact is turned on.
Backup start request from
GX Developer or the backup
start contact is turned on.
Before backup start
Backup start prepared
Backup start
preparation completed
Backup in execution
Backup completed