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Parameter expressions allow the result of an expression to be based on a conditional test (If, Then, Else). The expression function takes the form:
If the Boolean Expression returns true then the IF function returns the result of the True Expression, and if the Boolean Expression returns
false then the result of the False Expression is returned. The True Expression and the False Expression must return results of the same data type.
Since IF is an AVEVA E3D™ expression function, it can be used within an AVEVA E3D™ expression according to the normal rules for use of functions inside AVEVA E3D™ expressions. Therefore the <True Expression> and <False Expression> can contain IF function calls, which allows simple nested conditional statements to be constructed.