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(c) Operations of special relays and special register
*1
Figure 6.119 shows the operations of the SM609 (Memory card remove/insert enable flag), SM691 (Backup
start preparation status flag), and SD690 (Backup status).
*1: For details of the special relays and special register used for backup, refer to CHAPTER 12.
*2: This special relay is turned on/off by the system.
(d) Operating status of the CPU module
After END processing where the backup start setup request is accepted, the CPU module changes the
operating status to STOP at backup. Therefore, data can be backed up regardless of the operating status.
After backup, power off and then on the CPU module or reset the CPU module.(If the CPU module is not
powered off and then on or is not reset but set the RESET/STOP/RUN switch to RUN, the CPU module
remains in the STOP status).
*1: The status includes a stop error.
Figure 6.119 Special relays and special register at backup
Figure 6.120 Operating status of the CPU module at backup
ON
OFF
OFF
ON
0
12
3
4
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
SM691
(Backup start
preparation
status flag)
SM609
*2
(Memory card
remove/insert
enable flag)
SD690
(Backup status)
CPU operating
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
RUN/STOP
*1
/PAUSE
STOP
*1