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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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(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.
Table6.52 Backup status
Status Description Value in SD690
Before backup start Backup is not started. 0
H
Backup start prepared A memory card can be mounted/removed. 1H
Backup start preparation completed Set data to be backed up. 2H
Backup in execution Backup is in execution. 3H
Backup completed Backup is normally completed. 4H
Backup error Backup failed due to an error. FFH
Figure 6.118 Flow of status change at backup
Start
Before backup start
Backup start prepared
Backup is ready to start.
Backup start preparation completed
Backup in execution
Backup to the memory card is completed.
Backup completed
End
Backup failed.
Backup error
Data are backed up again.
Backup start setup
request from
GX Developer
The backup start setup
contact is turned on.
Backup start request
from GX Developer
The backup start contact
is turned on.