1.1.3. Build an Expression through Historian Tags

The Historian section in the Build Expression window provides you with options to create an expression using Historian tags.

The Historian section contains the following boxes and buttons:

Box/Button Description
Connection Select an existing Historian connection or add a new Historian connection.
Tag Name The Historian tag that you want to use to create an expression.
Search Retrieves and displays records based on the Historian connection established.
Filters

Filters the displayed records based on the following parameters:

  • Tag Name

  • Description

  • Engineering Unit

  • Data Type

  • Interface Name

  • Source Address
Clear Filters

Removes any filters applied to the displayed records.

Note: This button is disabled if no filters are applied.
Max record limit Limits the number of records displayed.

To create an expression using Historian tags:

  1. In the Build Expression window, in the Historian section, in the Connection drop-down list box, select an existing Historian connection or add a new Historian connection.
  2. After the connection is established, enter the name of the Historian tag that you want to use to create an expression.
  3. Select Search to display all the records associated with a Historian tag. You can also select Filters to filter the displayed records based on certain parameters.
  4. In the list of displayed records, double-click the record that you want to create the expression with. The record is added to the Expression box.
  5. Select Functions to add functions to the expression.
    Note: Historian tags can be configured in the expression only when Historian functions are used.
  6. Select OK.

    Result: An expression is created using Historian tags.