RSView Supervisory Edition Installation Guide

• • • • •RSVIEW SUPERVISORY EDITION USER’S GUIDEUsing multiple data log modelsAt run time, up to 20 models can run simultaneously on each RSView SE server. Usemultiple 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.Displaying historical data in a trendYou can display historical data in a trend by assigning a tag from a data log model to apen. For information about trends, see Chapter 19, Setting up trends.Data log storage formatsLogged data is stored in either an internal file set or in an ODBC-compliant database.File sets store tag values in proprietary-format files. You cannot view the contents of thesefile sets, except in trends. File sets provide faster performance for historical trends than anODBC database.If you log tag values to an ODBC database, you can view the data in trends, or use thirdparty,ODBC-compliant tools to analyze and create reports from the data. If the ODBCdatabase becomes inaccessible, RSView logs the data to backup files in proprietaryformat.To use data in multiple formats, define multiple data log models for the same tags.Log file setsData log files are stored in sets of three. Each file set includes a file for storing numericvalues (either integers or floating point values), text, and tag names.How log file sets are namedWhen a log file set is created, it is named automatically. The name is based on the date thefile was created and the type of data it contains.RSView names the log file sets using long file names. The maximum length of a log fileset’s name, including its path, is 200 characters. File sets are named using the followingformat for the file name:YYYY MM DD NNNN .dat• YYYY is the year.13-2