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CHAPTER 3 FUNCTIONS
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3.32 CPU Module Data Backup/restoration Function
3.32.2 Restoration function
3.32.2 Restoration function
This function restores data backed up to an SD memory card as necessary.
(a) Restoration target folders
Set a folder to be restored from backup data in an SD memory card with SD919 to SD921. The latest backup
data can be restored with bit13 of SD918.
*1 The latest data indicates the backup data in the date stamp folder which is the closest to the present time, and has the
rearmost serial number.
(b) Restoration target data
Set the restoration target data with SD917.
(c) Restoration of the special relay and special register
Set whether to restore the special relay and special register with bit14 of SD918.
Note that the following special relay areas and special register areas, which are used for the CPU module
backup/restoration function, are not restored even if bit14 of SD918 is on.
• SM916, SM922, SM924, SM1925, SM1926, SM1928, SM1929, SM1931, SD916, SD922, SD1925,
SD1926
Special register Description
Bit13 of SD918
Sets the function setting of restoration with bit patterns.
Off: Restores the specified data in the restoration target folders.
On: Restores the latest data.
*1
SD919, SD920
Specifies the date of the folder to be restored in BCD.
SD919: Year, SD920: Month and day
SD921 Specifies the numbered folder (00001 to 32767) to be restored.
Value of SD917 Restoration target data setting
0 All target data
1 Device data only
2 All target data except for device data
Bit14 of SD918 Description
On Restores the special relay and special register.
Off Does not restore the special relays and special registers.
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