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1、BoilerlevelcontrolsystembasedonControlLogix5550PLCAbstract-ThispaperisaresearchdesignbasedonEFPTprocesscontroldevice.Inthedesign,actualindustryfieldhasbeensimulatedandcorrespondingmodelinghasbeencarriedonfortheboilerlevelsystem.ThentheappropriatePIDparameterhasbeensortedou
2、tandControlLogia5550PLChasbeenusedtocontroltheentireboilerlevelsystem.Atlast,acorrespondingcontrolinterfacehasbeenestablishedandtheboilerlevelhasbeenunderasafeandaccuratecontrolKeywords：EFPT，PID，Modeling，Boilerlevel;1IntroductionThetaskoftheindustrialboilerlevelcontrolisto
3、maintainadynamicbalancebycontrollingthewaterflowandevaporation,sothatthedrumlevelcanbemaintainedinthetechnologicallevel,whichisanecessityforensuringsafeoperationandalsooneofthemainindicatorsoftheboiler'snormaloperation.Waterlevelwhichistoohighwillaffecttheeffectofthesteam-
4、waterseparation,buttoolowitiswillbreakringcycleorevencauseboilerexplosion.Toensureasafeandefficientproduction,theboilerlevelmustbestrictlycontrolledinmaintainingconstantorchangingonlyaccordingtoacertainrule.UsingLogix5550PLCwithanalogyI/Omodules,launchedbyRockwellAutomatio
5、nCompanyascontrollers,andEFPTprocesscontrolexperimentaldeviceascontrolobject,thissystemhavebroughttheboilerwaterlevelunderanaccuratecontrolinaminiboilersystemwithsensorsandactuatorsthatusedin23industrialproduction.Fig.1Boilerlevelsettingvalueadjustmentsystem2SystemOverview
6、ThissystemiscomposedofanEFPTprocesscontroldevice,aninverter,aLogix5550PLCandacomputer.EFPTprocesscontroldeviceisasimulatedheatingandwatersupplyanddrainagesystemforamicro-smallboiler.Itrealizesprocesscontrolinaminiboilersystemwithsensorsandactuatorsusedinindustrialproductio
7、n.Theactuatorincludesnotonlymeasuringappliance,butalsoACinverter,heatingcontroller,heaterandsoon.Thesystemsimulatesindustryscenethroughamini-boilerheating,watersupplyanddrainagesystem,whichisreliableandvisual.Inthedesign,boilerLevelwasselectedasthecontrolledvariable.Thecon
8、trolledobjectiscomposedofthewatertrough,theforcepump,theboilerandthepipe-linevalve.MicroM
