Mitsubishi Electric Q01UCPU User Manual page 294

(i) Required time for restoration
According to the number of data (folders) backed up, file size, and number of files, a restoration may take time.
Due to the time, for an automatic restoration at a multiple CPU system configuration, an error occurs in other
CPU modules, and an error occurs also in the CPU module restored automatically after the completion of the
restoration. The restoration itself, however, is completed correctly. Therefore, change SD917 (Restoration
target data setting) so that only the device data, which is cleared by the restart of the system, shall be restored,
and execute the automatic restoration again.
(j) Reflection of restored data
Some of the parameters are reflected only when the CPU module is powered off and then on or is reset. If a
restoration is executed while the CPU module is in STOP state and then is switched to RUN, the CPU module
may not operate with the backed up data. In that case, power off and then on or reset the CPU module. For
device data, since the device data except the latch-specified devices is initialized by powering off and then on
or resetting the CPU module, restore the device data again as the need arises.
(k) Completed with an error
Since a restoration is completed with an error, do not execute a restoration in the following situation.
• Any files which have exactly the same name as the backup data exist in the restoration destination, and
also, which the file password is set
• The data in the backup folder is deleted (Do not delete the data in the backup folder that is likely to be
restored)
• An error exists in the backup data (the backup data which has been changed its contents or which the
CPU module is powered on and then off during the backup)
(l) Parameter-valid drive at automatic restoration
When bit1 of SD918 (Restoration function setting) is turned off (No format), always check the data in the CPU
module of restoration destination before restoration. When the drive formatting is invalid, if the parameter-valid
drive in the CPU module of the restoration destination is different from the one at the backup, parameters in the
data backed up cannot be valid as following example.
When the parameter-valid drive at backup is the standard ROM (Drive 4), and parameters exist in the
Ex.
program memory (Drive 0) in the CPU module of restoration destination
If the drive formatting at automatic restoration set to invalid, parameters are restored to Drive 4 while the
parameter-valid drive is still Drive 0. Thus, parameters in the program memory shall be valid.
(m) The rise instruction at restoration
At a restoration of program files, the execution status of the instruction becomes non-execution. Therefore, if
the restoration is executed while SD917 is 0 (all target data) or 2 (all target data except for device data) and the
execution condition of the rise instruction (PLS and P) is satisfied when the RUN/STOP/RESET switch from
STOP to RUN, the rise instruction is executed.
(n) Restoration of SFC program and device data
When the SFC program and device data are restored, turn on SM326 (SFC device clear mode) and then switch
to RUN after the restoration. If the CPU module is changed from STOP to RUN after the restoration while
SM326 is off, the device is cleared.
(o) When using the IP address change function
If a backup is performed while the IP address is stored in IP address storage area (flash ROM), the value of the
area is changed at a time of restoration. The IP address is changed at the following timing.
• Restoration by turning on SM1929: When the CPU module is powered off and then on or is reset
• Automatic restoration using SD918: When an automatic restoration is executed
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