Mitsubishi Electric MELSEC-Q00U(J)CPU

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(c) Operations of the special relay and special register
*1
The following figure shows the operations of SM609 (Memory card remove/insert enable flag), SM691 (Backup
start preparation status flag), and SD690 (Backup status).
*1 For details of the special relay and special register used for this function, refer to the following.
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
*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 its
operating status to STOP. Data can be backed up regardless of the operating status. After the data backup
processing ends, power off and then on or reset the CPU module. (If only the RESET/STOP/RUN switch is
moved to RUN without power-on or reset, the operating status of the CPU module remains in STOP.)
*1 The status includes a stop error.
ON
OFF
OFF
ON
0
12
3
4
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
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
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
RUN/STOP
*1
/PAUSE
STOP
*1