Programmatically set limits of a test step

[Quintin]

I am rather new to TestStand and was wondering how can I programmatically set limits based on the value of a global variable?

[Antonio Lie]

Quintin,

You can use the property loader step type to load your limit values from a source file or database.

If you want to set them based on a global variable you can use a pre-expression.

Right Click on your step...

Go to Properties...->Expressions->PreExpression

Add a expression to set your step limits. For example for a numeric Limit Test Step you could add the following pre-expression:
Step.Limits.Low = StationGlobals.Global1,Step.Limits.High = StationGlobals.Global2

Pre-Expression is evaluated before the module is executed.

If you want to learn more about the 'order of actions that a step performs' you can go to the Step Execution Section in Reference Manual Chapter 3.

Hope it Helps.

Antonio Lie.

[Quintin]

Thanks Antonio,

I ended up using expession statesments inside IF, ELSE flow control steps, if that doesn't work I will rework to use your method.

Quintin