Mitsubishi Electric melsec q00ujcpu User Manual page 305

(c) Operations of special relays and special register
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).
Before backup start Backup start prepared
*2
SM609
(Memory card
ON
remove/insert
OFF
enable flag)
SM691
ON
(Backup start
OFF
preparation
status flag)
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).
Before backup start
CPU operating
RUN/STOP
status
/PAUSE
*1: The status includes a stop error.
6 - 154
Backup start setup request from
GX Developer or the backup
start setup contact is turned on.
1
0
Figure 6.119 Special relays and special register at backup
Backup start setup request from
GX Developer or the backup start
setup contact is turned on.
Backup start prepared
*1
Figure 6.120 Operating status of the CPU module at backup
*1
Backup start request from
GX Developer or the backup
start contact is turned on.
Backup start
preparation completed Backup in execution
2
Backup start request from
GX Developer or the backup
start contact is turned on.
Backup start
preparation completed Backup in execution
*1
STOP
Backup completed
3 4
Backup completed