Expression Builder    

Properties | Adding an expression | Expression Builder Syntax

The Expression Builder dialog box is where you bring data sources, numeric constants, math functions, and math operations together to form an expression, that can then be used in charts, grids, datalinks, shape animations, and so forth.

NOTE: Expressions are not available for the following objects: Alarm Analysis, Image, Text, Time Component, and Button.

Data Source Aliases

To use data source items (such as SQL statements or Historian tags), you must alias the specific item you want to use. For example, to use the SQL statement 'ssEmissionLocationTotals', you select the statement from the Data Source Browser and then enter an alias (ID) for it, as the following figure shows:


After the data source aliases have been created, the IDs that you assigned are available in the data source drop-down list on the Edit Expression tab. The Edit Expression tab is where the expressions are created or edited.

Parameterized data sources that are used in expressions are available as target parameters for linking. For more information on linking objects, see Parameter Connections.

Historical Data Sources and Time Settings

Time settings such as the data refresh rate, start and end time settings, and the time zone can be configured for historical data sources used in expressions. These settings will be effective when only one historical data source is used in the expression. However, when more than one historical source is used in an expression, the following functional exceptions apply:

See Also


Time Management