Duratech DA05 WinCE Instrukcja Użytkownika Pobierz pdf (Strona 23)

For loop While loop

Case

structure

Flat sequence

structure

Stacked sequence

structure

Event

Structure

UniversitàdegliStudidiCatania

IntroductiontoNILabVIEW

 LabVIEWG‐Language:ControllingProgramExecution

Structures aregraphicalrepresentationsoftheloopsandcasestatementsoftext‐basedprogramminglanguages.

Usestructuresontheblockdiagramtorepeatblocksofcodeandtoexecutecodeconditionallyorinaspecificorder.

Likeothernodes,structureshaveterminalsthatconnectthemtootherblockdiagramnodes,execute

automaticallywhen

inputdataisavailable,andsupplydatatooutputwireswhenex ecutioncompletes.

Eachstructurehasadistinctive,resizableborder toenclosethesectionoftheblockdiagramthatexecutesaccordingto

therulesofthestructure.Thesectionoftheblockdiagraminsidethestructureborderiscalledasubdiagram

.The

terminalsthatfeeddataint oandoutofstructuresarecalledtunnels.Atunnelisaconnectionpointona structureborder.

ForLoop—Executesasubdiagram asetnumberoftimesor,if

youaddaconditionalterminal,untilaBooleanconditionor

anerroroccurs.

WhileLoop—Executesasubdiagram untilaBoolean

conditionoranerroroccurs.

Casestructure—Containsmultiplesubdiagrams,onlyoneof

whichexecutesdependingontheinputvaluepassedtothe

structure.

Sequencestructure—Containsoneormoresubdiagrams that

executeinsequentialorder.

Eventstructure—Containsoneormoresubdiagrams that

executewheneventsaregeneratedbyuserinteraction.

Timedstructures—Executeoneormoresubdiagrams with

timeboundsanddelays.

ConditionalDisablestructure—Containsoneormore

subdiagrams,exactlyoneofwhichcompilesandexecutesat

run‐time.

DiagramDisablestructure—Containsoneormore

subdiagrams,exactlyoneofwhichcompilesandexecutesat

run‐time.

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