User manual

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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