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22 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
22.2 Restoration Function
Automatic restoration with the SD CARD OFF button
Backup data is automatically restored when the CPU module is powered on or is reset while the SD CARD OFF button is
being pressed.
When the automatic restoration using SD955 and the automatic restoration with the SD CARD OFF button are
executed at the same time, the automatic restoration with the SD CARD OFF button is prioritized. Even if bit 0
of SD955 (Automatic restoration) is set to on, the automatic restoration with the SD CARD OFF button is
executed.
Restoration setting
The automatic restoration with the SD CARD OFF button only restores data using the SD CARD OFF button (the special
register area is not operated from the engineering tool or the GOT). Set it before the backup processing.
*1
( Page 319
Operating procedure (when a stop error has occurred in the CPU module))
*1 The restoration settings are restored to the SD memory card as a system file for the automatic restoration with the SD CARD OFF
button at backup.
The automatic restoration with the SD CARD OFF button restores the latest backup data out of multiple
backups saved. When restoring a specific backup data, prepare the data and the SD memory card in which
the system file for the relevant backup data only and the automatic restoration with the SD CARD OFF button
is stored.
Operating procedure
Power on or reset the CPU module while pressing the SD CARD OFF button.
* 1*2*3
*1 Do not execute the automatic restoration with the SD CARD OFF button and the firmware update function at the same time. Otherwise,
the automatic restoration with the SD CARD OFF button does not operate.
*2 If the system file for the automatic restoration with the SD CARD OFF button is not stored to the SD memory card, 300CH error is
detected.
*3 Release the SD CARD OFF button within 10 seconds after the READY LED begins to flash. If the switch is pressed more than 10
seconds, restoration may fail.
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