264
(c) Operation of data backup using contacts
The following figure shows the operations of the backup start setup contact, backup start contact, SM691
(Backup start preparation status flag), and SD690 (Backup status).
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.
(2) Data backup using a programming tool
Data backup using a programming tool can be performed on the "Create Backup Data for PLC Module Change"
window.
[Online] [PLC Module Change] [Create Backup Data]
For details, refer to the following.
Operating manual for the programming tool used
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
the programming tool or the backup start
setup contact is turned on.
Backup start request from
the programming tool or the backup
start contact is turned on.
Before backup start
Backup start prepared
Backup start
preparation completed
Backup in execution
Backup completed
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