Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 295

(4) Precautions
The following describes precautions for the restoration function.
(a) Removal/insertion of the SD memory card and power-off/reset of the CPU module
during the restoration
Do not perform the following operations during the restoration operation.
• Removal and insertion of the SD memory card
• Power-off or reset of the CPU module
If performed, the data in the CPU module is left in an incomplete state, which is middle of the restoration
processing. Do not run the CPU module with this incomplete state. Doing so may cause an unintended
operation. Restore the data again or format each drive in the CPU module, and clear devices before writing
programs or parameters to the programmable controller.
(b) Suspending processing of the restoration
Except for the automatic backup using SD918, the following operations can suspend the processing of the
restoration.
• To disable the SD memory card operation forcibly
• To enable removal and insertion of the SD memory card
If the restoration processing is suspended, the data in the CPU module is left in an incomplete state, which is
middle of the restoration processing. Do not run the CPU module with this incomplete state. Doing so may
cause an unintended operation. Restore the data again or format each drive in the CPU module, and clear
devices before writing programs or parameters to the programmable controller.
(c) Model name of the CPU module to be restored
Always restore the data to the CPU module whose model name is the same as the one of the backup source. If
not, restoration cannot be performed.
(d) Combination of automatic restoration and other functions
Do not set automatic restoration using SD918, boot operation, automatic restoration for the CPU module
change function, and restoration for the latch data backup to standard ROM simultaneously. If those functions
are set simultaneously, the automatic restoration is not operated when the CPU module is powered off and on
or is reset.
(e) State of the CPU module
If the states of the CPU module differ between the restoration destination and the backup source, set SD917 to
0 (all target data) and then restore the data.
The data cannot be restored when SD917 is 1 (device data only) or SD917 is 2 (all target data except for all
device data).
(f) High speed monitor area from other station
If a restoration is executed without formatting Drive 0 (program memory) of the CPU module to be restored, the
setting of high speed monitor area from other station follows to the setting of the CPU module to be restored.
(g) When the same name file exists in the restoration-target CPU module
If the same name file as the one in the backup data exists in the restoration-target CPU module, the file shall be
overwritten by the one in the backup data.
(h) Changing operating status during restoration
During a restoration, the CPU module remains in STOP status even though the RUN/STOP/RESET switch is
changed from STOP to RUN, or remote RUN or remote PAUSE is operated. If the operating status of a CPU
module is changed, it shifts to the one changed after the restoration is completed.
CHAPTER 3 FUNCTIONS
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