Mitsubishi Electric L02SCPU User's Manual And Reference page 189

Turn on the backup start setup contact and then the backup start contact. Data are not backed up when only
the backup start contact is on.
Turn on the backup start setup contact.
Preparation for backup:
1) Set the CPU module to the STOP status.
2) Set the SD memory card so that the card
can be removed from the CPU module.
1) Check that the preparation for backup is
completed by the following methods.
Check the LEDs.
Check the special relay and special register.
(a) SM691 is on.
(b) SD690 stores 2h.
2) Remove the SD memory card.
3) Install a SD memory card for storing
backup data.
4) Turn on the backup start contact.
Back up data.
Check that the backup is completed by
the following methods.
Check the LEDs.
Check the special relay and special register.
(a) SM691 is on.
(b) SD690 stores 4h.
: Operation by the CPU module
: Operation by the user
*6 Since SM691 (Backup start preparation status flag) is on, data can be backed up again by turning off and then on the
backup start contact.
CHAPTER 3 CPU MODULE FUNCTIONS
6
Check for backup error* .
Check the LEDs.
Check the special relay and special
register.
(a) SM691 is on.
(b) SD690 stores FFh.
(c) SD689 stores an error cause.
3
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