Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 207)

Configuring data logging

7–7
Example of short file names for narrow .dbf
format
For narrow .dbf file format, data log files are created in sets of three.
Even if your project does not contain a particular type of data, three
files are created. If data is not available for a file, the file remains
empty.
Example: Narrow .dbf short log file name
The log file named 971028cs.dbf was created in the year 97, month 10,
and day 28. The c indicates that this is the third file set created that
day. The s indicates that this is a file containing string tag data.
Example: Narrow .dbf short log file set
If you were to look in the directory containing the data log files, you
would find three files with almost the same name.
971028ct.dbf contains the tag name data
971028cf.dbf contains the floating point data from analog and
digital tags
971028cs.dbf contains the data from string tags