基于PC机的软PLC的研究(3)

发布时间:2021-06-07

基于PC机的软PLC的研究

华中科技大学硕士学位论文

Abstract

1-heworkingprinciplesofsoftProgrammableLogic

structureisControllers(PLC)anditssystemdiscussedinthepaperEspecially,theprocessingofLadderDia野am(LD)andInstructionList(IL),translationalgorithmbetweenthetwolanguagesisdiscussedindetailTheresearchinvolvesofthestudyOnthewholestructureofsoftPLC,themodelconstructionofLDanditsprocessingalgorithm,thecompileinterpreterofILandthetranslationalgorithmbetweenILandLD

TheLDistheprogramminglanguageforthesequencecontrolsystem,composedoftherelays,switches,wiresetc.AftertheLDprogramissimplifiedintotwo—valuelogicalsystem,itcanbelogicallyanalyzedandeffectivelyprocessedbythematrixknowledge

q-heILprogramissimilartotheprogramwfiaeninadvancedprogrmnminglanguageltsprocessresemblesthatofotheradvancedlanguages,whichisrealizedbythecompileprinciples.However.ILprogrmnhasitso、Ⅳncharacters.Therefore.thecompile—interpreter

onofILisimplementedbytheStandardTemplatekibrao'(STL)basedcompileprinciples

TheLDpresentsthefunctionwithsymbolsandshowstherelationshipbetweentheinstructionswithseries—parallelconnections.ThestructureoftheLDisverymuchlikenettopolo毋calgraphicindatestructureTheLDcanbeabstractedasnettopologicalgraphicaccordingtosomerulesThetopologicalsortinnettopologicalgraphicisusedtorealizethetranslationfromtheLDtotheIL

ThetranslationfromtheILtOtheLDactuallymeanstolinkthesymbolsaccordingsomerulesInthepaper,binarytreestructureisusedtoexpressthelogicrelationshipbetweentheinstructions.Thisstructure

LDtorealizetheirtranslationservesasamediumthatlinkstheinstructionand

ThewholesystemisdesignedfollowingsoftwareengineeringdevelopmentthoughtandObject—OrientedModel(OOM)Sothe

SOHI'Cestructureofthesystemisclear,convenientformaintaining.AndthecodeishighlyreusableⅡ

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