Yokogawa Removable Chassis DX1000N - Manual (Page 35)

Explanation of the
Advanced Security Function
IM 04L41B01-05EN
1-29
1
2
3
Index
App
1.5 Audit Trail Function
SET0 Directory Operations
Save Operation (When not using media FIFO)
If there is not enough free space on the CF card, the DX cannot save the data in the
internal memory to the CF card. When this happens, an error occurs, and the save
operation cannot be performed. Use another CF card to save the data.
Save Operation (Always retain most recent data file/media FIFO)
The newest data files are always kept on the CF card. With this method, you can use the
DX continuously, without changing the CF card.
For the setting procedure, see section 6.2 in the User's Manual.
• Operation
File 1 File 2 File 3 File 4 Deleted Saved
Update date
Medium
Old New
If there is not enough space to save a new file, the DX deletes the oldest files and
then saves the new file. This operation is referred to as FIFO (first in first out).
• FIFO is only used when the following files are saved automatically. When files are
saved using other methods, FIFO is not used.
Setup files and change settings log files
• Files subject to deletion
All files in the destination directory, except for the ones listed below, are subject to
deletion.
Files not subject to deletion: Hidden files, read-only files, and files contained within
subdirectories in the destination directory.
• The most recent 100 files are retained. If there are more than 100 files in the
destination directory, even if there is enough free memory, older files will be deleted
so that the file number remains at or below 100.
• When there are more than 100 files in the destination directory, one or more files
are deleted before the new file is saved. The number of files does not remain at or
below 100 in this case.