Automatic Restoration Using Sd955; Checking Restoration Errors - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Automatic restoration using SD955

Backup data is automatically restored when the CPU module is powered on or is reset.
Initialization at the automatic restoration
Set whether or not to initialize drives other than the SD memory card at execution of the automatic restoration with the bit 1 of
SD955 (Restoration function setting).
This setting is enabled only when SD954 (Restoration target data setting) is set to 0 (All target data).
Bit 1 of SD955
Off
On
Operating procedure
1.
Set restoration target data with SD954.
2.
Set restoration target folders with SD956 (Restoration target date folder setting) to SD958 (Restoration target number
folder setting). (These settings are not required when the bit 13 of SD955 (Restoration function setting) is on.)
3.
Set each setting with the bit 1 and bit 13 to 15 of SD955.
4.
Turn on the bit 0 of SD955.
5.
Power on or reset the CPU module.
If the restoration processing is completed with an error and SM959 (CPU module data restoration error check flag) turns on,
check SD959 (Restoration error cause), take actions, and then restore the data again as required.
• Since the special register set for the automatic restoration is a latch area, setting data is held.
• SD955 holds its setting even after the CPU module is powered on or is reset. Thus, if the CPU module is
powered on or is reset while the bit 0 of SD955 is on, the automatic restoration is executed again. Not to
perform the automatic restoration when the CPU module is powered on or is reset next time, turn off the bit
0 of SD955 after a restoration is completed and then power on or reset the CPU module.

Checking restoration errors

• When an error occurs in the restoration processing triggered by turning on SM1354, a diagnostic error is not detected and
an error code is stored in SD959 (Restoration error cause). ( Page 703 List of error codes)
• When an error occurs at the automatic restoration using SD955, a diagnostic error is detected and an error code is stored
in SD959. ( Page 703 List of error codes)
15 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
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15.2 Restoration Function
Restoration target data setting
Not initialized
Initialized