Referencing values through graphics expressions

A graphics expression is a language-neutral expression that provides a means for graphics configuration properties to reference either live data or values within Graphics Studio configuration and then resolve that information to a single value at the appropriate time in DeltaV Live. The resulting value either presents itself to users as it is or in a more useful way, such as through animation. In DeltaV Live, graphics update periodically to reflect the dynamic value determined by the expression's result.

Graphics expressions can be configured for any property that supports opening the Script Assistant and a browser window. You can build these expressions by entering the expression in the property field, browsing to the desired value, or using the Script Assistant.

Graphics expressions are built using the DeltaV Live-supported TypeScript operators, TypeScript objects and their functions, Emerson-provided objects and their functions, DeltaV Live parameter path strings, and Graphics Studio prefixes (such as Dsp. or Lyt.)

These expressions are evaluated using data quality information available for DeltaV parameters. If the data quality for any DeltaV parameter value in the expression is anything other than good, the data quality for the final computed value reflects the worst data quality.