Backup Function - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

15.1

Backup Function

This function backs up data of a specified CPU module in an SD memory card.
The backup function operates even when the CPU module is in the RUN state.
When executing the backup function with the CPU module in the RUN state, do not change device/label data
during execution of the function. Doing so may cause data inconsistency of the device/label data and the
contents of the backup data may unintentionally change.
Setting the upper limit value for the number of CPU module backup data
When the backup processing has not been executed (when no backup data folder (CPU data folder) exists in the SD memory
card), the upper limit value for the number of CPU module backup data can be set.
The number of CPU module backup data in the upper limit value setting is the number of date folders.
The upper limit value for the number of CPU module backup data is enabled by turning on the bit 5 of SD944 (Enable the
upper limit value for the number of CPU module backup data). The set value can be checked in SD960 (Upper limit status for
the number of CPU module backup data).
When the bit 5 of SD944 is turned off, no upper limit value setting is applied.
Special relay/Special register
SM960
Bit 5 of SD944
SD960
SD1353
If data folders are created more than the capacity of the SD memory card before the number of them reaches
the upper limit value for the number of CPU module backup data, the backup processing is completed with an
error and the data cannot be backed up to reach the upper limit value.
15 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
270
15.1 Backup Function
Description
This relay specifies an operation of backup when the number of CPU module backup data reaches the upper
limit value. (This relay is valid only when the bit 5 of SD944 is on.)
• Off: The oldest date folder is deleted, and the backup operation continues.
• On: The backup operation does not continue if the upper limit value for the number of CPU module backup
data is exceeded. (In this case, the backup is completed with an error.)
Set to enable or disable the upper limit value for the number of CPU module backup data.
• Off: Disable (No limit (Date folders are created within the maximum capacity of the SD memory card.)
• On: Enable
This register displays the value (1 to 100) set in SD1353. If the bit 5 of SD944 is off, 0 is stored in this special
register (SD).
Set the upper limit value (1 to 100) for the number of CPU module backup data.