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15 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
15.2 Restoration Function
Changing the operating status during execution of restoration
During execution of the restoration processing, the CPU module remains in the STOP state even though the RUN/STOP/
RESET switch is changed from the STOP to RUN position or the remote RUN or the remote PAUSE is executed. If the
operating status of the CPU module is changed, the status will changes to the set status after the restoration processing is
completed.
Time required for completing the restoration processing
The restoration processing takes more time depending on the number of backup data sets (folders), file size, and the number
of files in the SD memory card.
In a multiple CPU system, if the automatic restoration has taken time and an error has occurred in another CPU module,
another error may occur in the CPU module to which the automatic restoration was executed after the completion of the
restoration.
In that case, shorten the time for restoration. Change the setting of SD954 (Restoration target data setting) to only the device
data that is to be cleared at a system start-up, and execute the automatic restoration again.
Monitoring stop at restoration
Stop monitoring before executing the restoration processing.
When the restoration processing is executed, programs, parameters, and device/label values may not be properly monitored
because they are changing.
Reflecting restored data
Some of the parameters are reflected only when the CPU module is powered on or is reset. If the restoration processing is
executed while the CPU module is in the STOP state and then is switched to the RUN state, the CPU module may not operate
with the backup data. In that case, power on or reset the CPU module. For device/label data, since device/label data except
for latch-specified devices/labels is initialized when the CPU module is powered on or is reset, restore the device/label data
again as required.
Abnormal completion of restoration
Since the restoration processing will be completed with an error, do not execute the restoration processing in the following
cases.
• The name of a file in the restoration destination CPU module and the name of a file in backup data are identical, and a file
password has been set.
• Data in a backup folder has been deleted. (Do not delete the data in backup folders that are likely to be used for
restoration.)
• Backup data has problems. (Backup data has been changed or the CPU module was powered off during execution of the
backup processing.)
Instruction executed at the rising/falling edge when data is restored
When the program file is restored by turning on SM1354, the execution status of instructions is undefined and the instructions
executed at the rising/falling edge may not work properly.
To operate the system by restoring the backup data, use the automatic restoration with SD955.
When the special relay and special register are restored
When a restoration is operated with the setting to restore the special relay and special register, the system will be operated
with the values (time, day of the week, day, time, and the upper limit value of the number of backup data for the automatic
backup set to the backup function setting) before restoration. (The backup function setting will not be re-set although the
special register areas are overwritten by the restoration.)
To operate the system with the restored backup function setting, set the backup function setting again.
Summary of Contents for MELSEC iQ-R-R00CPU
Page 2: ......
Page 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Page 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Page 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Page 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Page 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
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