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(2) Operations of backup to a memory card
(a) Mounting/removal of a memory card
In a system using a memory card, the memory card can be changed/removed after preparation for backup has
been completed (Turning on SM609 (Memory card remove/insert enable flag) is unnecessary).
After preparation for backup has been completed, the CPU module turns off SM604 (Memory card in-use flag).
(b) Status of backup to a memory card
Table6.52 shows backup status.
Status
Before backup start
Backup start prepared
Backup start preparation completed
Backup in execution
Backup completed
Backup error
Backup start setup
request from
GX Developer
Backup start preparation completed
Backup start request
from GX Developer
Backup to the memory card is completed.
Table6.52 Backup status
Backup is not started.
A memory card can be mounted/removed.
Set data to be backed up.
Backup is in execution.
Backup is normally completed.
Backup failed due to an error.
Start
Before backup start
The backup start setup
contact is turned on.
Backup start prepared
Backup is ready to start.
The backup start contact
is turned on.
Backup in execution
Backup completed
End
Figure 6.118 Flow of status change at backup
Description
Data are backed up again.
Backup failed.
Backup error
CHAPTER6 FUNCTIONS
Value in SD690
0
H
1
H
2
H
3
H
4
H
FF
H
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