Duratech DA05 WinCE Manual do Utilizador descarregar pdf (Página 21)

UniversitàdegliStudidiCatania

IntroductiontoNILabVIEW

 LabVIEWG‐Language:Nodes

Nodes are objects on the block diagram that have inputs and/or outputs and perform

operations when a VI runs.

They are analogous to statements, operators, functions, and subroutines in text‐

based programming languages. LabVIEW includes t he following types of nodes:

• Functions—Built‐in execution elements, comparable to an operator,

function, or statement.

• SubVIs—VIs used on the block diagram of another VI, comparable to

subroutines.

• Express VIs—SubVIs designed to aid in common mea surement tasks. You

configure an Express VI using a configuration dialog box.

• Structures—Execution control elements, such as For Loops, While Loops,

Case structures, F lat and Stacked Sequence structures, Timed structures, and

Event structures.

• Formula and Expression Nodes—Formula Nodes are resizable structures for

entering equations directly into a block d iagram. Expression Nodes are

structures for calculating expressions that contain a single variable.

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