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Summary, Tips, and Tricks on Making Decisions in a VI

Module by: National Instruments

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  • The Select function selects between two inputs dependent on a third Boolean input.
  • A Case structure has two or more subdiagrams, or cases. Only one subdiagram is visible at a time, and the structure executes only one case at a time.
  • If the case selector terminal is a Boolean value, the structure has a True case and a False case. If the selector terminal is an integer, string, or enumerated type value, the structure can have up to 231−1 2 31 1 cases.
  • Inputs are available to all subdiagrams of a Case structure, but subdiagrams do not need to use each input. If at least one output tunnel is not defined, all output tunnels on the structure appear as white squares.
  • When creating a subVI from a Case structure, wire the error input to the selector terminal, and place all subVI code within the No Error case to prevent the subVI from executing if it receives an error.
  • Formula Nodes are useful for equations that have many variables or are otherwise complicated and for using existing text-based code. Each equation statement must terminate with a semicolon (;).

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