Based-on-the-research-of-PLC-temperature-control-s

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BasedontheresearchofPLCtemperaturecontrolsystemofboilerAbstract:fromthedevelopmentconditionofboiler,PLCtypeselection,systemsoftwareandhardwaredesign,communicationupanddownamachine,theconfigurationprogramdesignispresentedinseveralaspects,suchas.BythetemperaturecontrolsystemofPLCdebuggingtheadvantagesofthesimple,lowcost,easytomaintenance,andeasytoexpandtothecorrespondingfieldofindustrialcontrol,goodportabilityisofgreatimportancetotheindustrialdevelopmentKeywords:PLC;Thesensor;Temperature;TheautomaticcontroWiththecontinuousdevelopmentofeconomy,theenvironmentproblemincreasinglyprominent.Boilerastheheatingsystemisoneofthemostimportantenergyconversiondeviceenergyconsumptionishuge,everyyearthenationalboilercombustionofmorethanonethirdoftotalenergyconsumption.Atpresent,thedomesticmostoftheurbanheatingsystemintheoperationoftheboilerequipmentagingbasicrelyonmanualoperation,automationlevelislow,safetyperformanceispoor,thecombustionefficiencyisnothigh,theairpollutionisveryserious.Therefore,theconfigurationofautomatictemperaturecontrolsystemforboilerintoday'sincreasinglyseriousenvironmentalpollutionsituationisextremelyimportant.1boilertemperaturecontrolbasedonPLCisintroducedThissystemisbasedonPLCboilertemperaturecontrol,throughtheboilerinternalsensorfortemperatureandflowratefeedbacktosystemparameterssuchastemperaturecontrol,theautomaticcontrolofboilertemperatureisrealized.PLCprogrammablecontrollerisakindofcombinedrelaycontrollerandcomputer,throughtheinstaller,centralprocessingunitCPUasthecoreandI/Odevicesconnectedtoitsuseinthefieldofindustrialcontrolcomputerisslightlydifferentwithordinarycomputer,mainlybytheCPU,memorycell,basiccomponentssuchastheI/Ointerfacecircuit,powersupply,plusextension,programmer,externalequipment,etc.PLCprogrammablecontrollercannotonlyreplacetheordinaryrelay,butalsohasAvarietyofextensions,suchasA/Dmodule,etc.Therefore,theuseofPLCforautomaticcontrolofboilerprovidesanewsolution,someadvancedcontrolmethodtotheapplication.UsingPLCprogrammablecontrollerforboilersystem,realizetheautomaticcontrolofthetemperature,ontheonehandcanimprovecombustionefficiency,reducefueluseandemissionsofharmfulgasinfluegas,reducingtheairpollution;PLCcontrolsystem,ontheotherhand,throughavarietyofsensorsinsidetheboilertemperature,pressure,flowandotherrelatedparameters,realizedtheautomaticcontroloftheparameterssuchastemperature.Reducesthemanuallabor,basicallyjustintheengineroomcontrolroomcanfullyunderstandtheoperationoftheboiler,reducethemanpowercost,improvetheleveloftheautomationmanagementsystem.2thetemperaturecontrolsystemdesign2.1thetemperaturecontrolsystemdesignThisdesignbySiemensS7-300programmablecontrollerforthenextbitmachine,twoindustrialcontrolmachineforPC.PCthroughindustrialcontrolsoftwaretorealizeearlywarningfunctionssuchasalarm,underamachineadoptsSiemensS7-300programmablecontroller,realizeautomaticcontrol,suchastemperature,flowrateintheboilercontrollevelandsafetyguaranteed.Systemforthetemperatureoftheobject,andusingPT100typethermalresistancesensorsinsidetheboilerwatertemperature,andthenpassedtoEM235moduletemperaturetransmitter,convertthesignalthroughthePIDarithmetic,adjustedtogetastablePIDparametervalues,thentheinputsignaltothesiliconcontrolledvoltageregulatortocontrolthevoltageoftheheater,achievethepurposeofregulatingtemperature.2.2thetemperaturecontrolsystemhardwaredesign1)thehostsystem.Usingtwosetsofindustrialcontrolcomputerhost,oneofthemasthemaincontrolmachine,anotheroneiscomplementaryhost,makedoubleinsurance.ConfigurationsoftwareWINCCSP26.0usingSiemensindustrialcontrolconfigurationsoftware.2)PLCprogrammablecontroller.SystemsuseSiemensSP-300-PLCprogrammablecontroller.Itsmodularstructure,easytoimplementdistributedconfigurationandhighcostperformance,strongelectromagneticcompatibility,resistancetoshockimpactperformanceisgood,inawiderangeofindustrialcontrolfield,becomeakindofeconomicalandpracticalsolution.VarietyofincreasingperformanceofCPUandrichwithmanyconvenientfeaturesI/Oextensionmodule(includingSMsignalmodule,communicationprocessorCP,IMinterfacemodule,etc.).Theusercanchooseaccordingtoactualapplicationmodule.3)theinstrumentequipment.Inordertoimprovetheanti-interferenceability,typeselectionofinstrumentmeterDDZ-IH45macurrentoutputfor0123,toensurethereliabilityofthesystem.Instrumentinclude:flowtransmitting,pressuretransmitter,temperaturetransmitter,liquidleveltransmitter,microoxygentransmitter,pressuretransmitter,etc.4)thefrequencyconversioncontrolroom.Mainlyincludes:powersupplycontrolcabinet,frequencyconversioncontrolcabinet,boilercirculatingpumpfrequencyconversioncontrolcabinet,controlcabinetisequippedwithvarioustypesofrelaycontactor,relay,etc.,lowvoltageelectricalequipmenttocompletethemotorstartandstop.2.3thetemperaturecontrolsystemsoftwaredesign2.3.1PIDinstructionalgorithmPIDcontrolleraccordingtotheerrorofthesystemparametervalues,calculatedbyproportionalintegralanddifferentialcontrolquantitytocontrol,socalled,PIDcontrolandPIDcontrol.Inthefieldofindustrialcontrol,PIDisstillinwideuse.Threekindsofcontrolvolumehavediff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