Mitsubishi Electric MELSEC iQ-R Series User Manual page 323

Timing for setting the upper limit value for the number of CPU module backup data
Set the upper limit value for the number of CPU module backup data before execution of the backup processing.
When the backup processing has been executed (a CPU data folder exists in the SD memory card) and the bit 5 of SD944
(Enable the upper limit value for the number of CPU module backup data) is turned on, an error will occur.
Even though the backup processing has been executed, turning off the bit 5 of SD944 can disable the upper limit value for the
number of CPU module backup data. To set the upper limit value for the number of CPU module backup data again, replace
the SD memory card with another one where no CPU data folder exist, or turn off and on the bit 5 of SD944 after deleting the
backup data folder.
SFC program status
Do not change the status of the SFC program, such as step active status and transition conditions during execution of the
backup processing. If the status of the SFC program was changed, the backup processing is completed with an error.
Time required for completing the backup processing
The backup processing takes more time depending on the size of data or the number of folders/files stored in the CPU
module.
22
22 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
321
22.1 Backup Function