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You need to find documentation for the C:\DelphiTestSystem\TestModules\Libraries\DAQmx.dll or for the custom Delphi Numeric Limit Test step. The expression is simply a call to the NIDMWaitXAnalogLineWin function from C:\DelphiTestSystem\TestModules\Libraries\DAQmx.dll with parameters specified in the parameters list displayed on the first screen.
It is possible that you have some custom dll build?
Michał Bieńkowski CLA, CTA Someone devote his time to help solve your problem? Appreciate it and give kudos. Problem solved? Accept as a solution so that others can find it faster in the future. Make a contribution to the development of TestStand - vote on TestStand Idea Exchange.