Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 580)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
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Using multiple data log models
At run time, up to 20 data log models can run simultaneously on each FactoryTalk View
SE Server.
Use multiple data log models to:
 Store related information in separate file sets.
 Log groups of tags at different rates.
 Log groups of tags based on events.
Data log storage formats
Logged data is stored either in an internal file set or in an ODBC-compliant database.
Each data log file set includes files for storing numeric values (either integers or floating
point values), text, and tag names.
Internal file sets store tag values in proprietary-format files. You cannot view the contents
of the file sets, except in trends.
If you log tag values to an ODBC database, you can view the data in trends, or use third-
party, ODBC-compliant tools to analyze and create reports from the data.
If the ODBC database becomes unavailable, FactoryTalk View logs the data to backup
files in proprietary format.
To use data in multiple formats, define multiple data log models for the same set of tags.
How log file sets are named
When you create a log file set, the set is given a name automatically. The name is based on
the date the file was created, and the type of data it contains. The maximum length of a log
file set’s name, including its path, is 200 characters.
File sets use the following file name format:
YYYY MM DD NNNN <Log File Identifier String> <(type)>.dat
where
 YYYY is the year.
 MM is the month.
 DD is the day.
 NNNN is the sequential file identifier.