Checking Backup Errors; Precautions - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Operating procedure (when a stop error has occurred in the CPU module)
Data is automatically backed up when a stop error occurs in the CPU module.
1.
Set the upper limit value for the number of CPU module backup data. (The setting method and operating procedure for
the upper limit value are the same as those for the upper limit value for the backup processing triggered by turning on
SM1351. ( Page 272 Operating procedure))
2.
To retry the automatic backup, turn on the bit 10 of SD944 (Backup function setting). For the retry of the automatic
backup, refer to the following.
Page 273 Retrying the automatic backup
3.
Turn on the bit 15 of SD944.
If the backup processing is completed with an error and SM953 turns on, check SD953, take actions, and then back up the
data again as required.
If a major error has occurred, the automatic backup may not be performed.

Checking backup errors

When an error has occurred, a diagnostic error is not detected and an error code is stored in SD953 (Backup error cause).
( Page 703 List of error codes)

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 labels accessible from external devices have been set in the CPU module
For the CPU module with firmware version "24" or earlier, the backup cannot be executed if labels accessible from external
devices have been set in the CPU module by access label settings from external devices.
Check that no such labels have been set in the CPU module and then execute the backup processing.
15 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
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15.1 Backup Function
15