Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 203)

Configuring data logging

7–3
relational database software to retrieve and manipulate the data. If the
database becomes inaccessible, RSView32 logs the data to backup files
in binary format.
If you need to use data in multiple formats, define multiple data log
models for the same tags.
The .dbf file format
Data logged in the .dbf format can be stored in narrow or wide
format. The data file names vary depending on which format you
choose.
Narrow .dbf file format
The narrow .dbf format stores one date, one time, and one tag value
per line. The following figure shows how tag values are stored in the
file. For a detailed description of the file’s contents, see page 16-13.
Wide .dbf file format
The wide .dbf format stores one date, one time, and multiple tag
values per line. The following figure shows how tag values are stored
in the file. For a detailed description of the file’s contents, see
page 16-15.
Date1 Time1 Tag1 value
Date1 Time1 Tag2 value
Date1 Time1 Tag3 value
Date2 Time2 Tag1 value
Date2 Time2 Tag2 value
Date2 Time2 Tag3 value
This is one
snapshot of data.