| This
option allows you to use dashboards you have already created in the Display
Builder to also define the data you want
to archive, so you can configure the Historian with the same displays you
are using to view your data. Display (.rtv) files created in the Display Builder contain
objects attached to the data you would like to store. A record is stored in
the history database every time new data is received by the Historian for
each data attachment in your configuration display.
For data to be stored and retrieved properly,
you must attach data to the appropriate type of object property for the
corresponding value. Numeric values must be attached to numeric object
properties and text values to string object properties. For example, if you
attach a numeric value to a meter's label (which is a string object
property), the numeric value will be stored in the database as a string
instead of a number and therefore will not be available on trend graphs.
Numeric values are stored in a numeric table (HISTORY or the table
name you specify). Textual values are stored in a string table (HISTORY_S
or the table name you specify). See
Historian
Database Setup
section for information on
configuring history tables.
When you attach data to a tabular object
property, such as valueTable, it is recommended that you create a
table in the history database to store that data. If you do not create a
table, data from your tabular element will be stored in standard history
tables and, in the case of tabular data with multiple columns, row integrity
will be lost. See Historian
Database Setup
section for information on
how to store tabular data.
For step-by-step instructions on creating
data configuration files for the Historian or to learn how to create a table
in the history database to store tabular data, go to
Examples>Archiving Data.
|
|
In more complex
situations, it is not desirable to archive every piece of data accessed by a
particular dashboard. In those cases, the Historian can be configured using
cache definition (.rtv) files that contain Cache objects specifically
defined to point to the historical data you wish to archive.
Cache definition (.rtv) files created in the Display Builder contain objects from the Caches
tab in the Object Palette. Object properties defined for these Cache objects
can indicate what sources of current and/or historical data you would like
to keep in memory. Specify which of these cached values to archive in a
history database and then use these cache definition (.rtv) files to configure the
Historian.
Go to Caches>Introduction for
information on
creating a cache definition (.rtv) file and to learn about which
Cache object properties are required to configure the Historian. |
