Free Space Adjustment Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.12

Free Space Adjustment Function

The free space adjustment function deletes old logging files and report files when the free space of an SD memory card
reaches a specified free space.
Configure the settings to prevent a logging stop due to the capacity shortage in the SD memory card.
The range of free space that can be specified is as follows.
Specification method
Percent specification
*1
Size specification
*1 If the specified size specification value exceeds 50% of the total capacity of the inserted SD memory card, the behavior of the function
will similar to when 50% is specified to the percent specification.
(Example) When 1500 MB is specified to the size specification while the SD memory card which has a total capacity of 2 GB is inserted,
the free space adjustment function will operate to delete the saved files when the free space of the SD memory card is 1 GB or less.
Operation overview
The following processes are performed when the amount of free space is set to the SD memory card settings.
• Check the free space in the SD memory card in 10-second periods.
• Delete the saved files of any of the data logging, event logging, or report which takes the greatest share in the following
rate. (The number of files saved in the SD memory card)/(The specified number of saved files)
If the rates are the same, saved files of any of the data logging, event logging or report of which the specified number of saved
files is the greatest are deleted. If the specified numbers of saved files are the same, the saved files of the data logging, event
logging and report in that order from the smallest setting number are deleted.
■Files for deletion
The objects of deletion are saved files created by the data logging, event logging or report function operated on high speed
data logger module.
■Files not for deletion
The following files are not deleted. When the size excluding the total size of the files not to be deleted from the total space of
the inserted SD memory card is larger than the specified size of free space, the free space of the SD memory card is not the
specified size.
• Accumulating file
• Latest saved file
• The saved files of data logging, event logging, and report for which 'Stop' is set for the operation when number of saved
files exceeds
• The saved files created by the data logging, event logging, or report function which are not set on the high speed data
logger module
• Recipe file
Specified range
10 to 50 %
50 MB to 4096 MB
1.12 Free Space Adjustment Function
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1 FUNCTION
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