Precautions - Mitsubishi Electric MELSEC iQ-R Series User Manual

Precautions

The following describes the precautions for the backup function.
Prohibited operation during execution of the backup processing
Do not perform the following operations during execution of the backup processing.
• Removing and inserting the SD memory card
• Powering off or resetting the CPU module
The above mentioned operations leave the backup data in the SD memory card in an incomplete state which is middle of the
backup processing. Do not use these data for a restoration. If these data are used, the restoration is completed with an error.
Suspending backup processing
The following operation can suspend a backup processing.
• Setting the SD memory card forced disable
Suspending a backup processing leaves the backup data in the SD memory card in an incomplete state which is middle of the
backup processing. Do not use these data for a restoration. If these data are used, the restoration is completed with an error.
Device/label data
To execute the backup processing, do not change device/label data during execution of the processing. Since device/label
data is divided into multiple scans and backed up, changes in the device/label data may cause data inconsistency.
When parameter settings were changed before execution of the backup processing
When programs or parameter settings were changed, check that operations are performed with the new programs and
parameter settings and then execute the backup function. If the backup processing is executed without the check of the
operations with the new programs and parameter settings, the restoration processing may not be executed.
Changing backup target data
Do not change backup target data in the CPU module during execution of the backup processing. If the target data was
changed during execution of the backup processing, the changes will not applied.
Special relay and special register that function as flags to execute other functions
Before executing the backup processing, turn off the special relay and special register that function as flags to execute other
functions. If the backup processing is executed when they are on, the corresponding function request may turn on and the
function may be executed at the restoration of data in the special relay and special register.
Data protected by security functions
■File password function
Unlock the file passwords of the files in the backup target CPU module. If any files to which file passwords have been set exist
in the CPU module, the files are not backed up.
■Security key authentication function
Locked programs are backed up in the locked state regardless of whether security keys have been written or not.
22 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
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22.1 Backup Function