基于PLC的计算机浸涂监控系统的设计和实现---------外文资料翻译.docx

外文资料翻译DesignandImplementationofPLCbasedComputerizedMonitoringinDipCoatingSystemABSTRACTThepresentstudyisaboutthedesignandimplementationofdipcoatingsystembasedonProgrammableLogicController(PLC)technology.ThePLCcorrelatestheoperationparameterscontrolrequiredbytheuserandmonitorsthesystemduringnormaloperationandunderdippingconditions.TestsofdipcoatingsystemdrivenbyDCmotordriverandcontrolledbyPLCproveahigheraccuracyinregulationascomparedtomanualhumanworks.Theimplementationofthehardwareandsoftwareforcontrolsystemandresultsobtainedfromtestsondipcoatingperformanceisprovided.Thus,PLCisprovedasaversatileandwideeffectivetoolinindustrialcontrolofelectricdrives.GeneralTermsProgrammablelogiccontroller(PLC),PrintedcircuitBoard(PCB),Toggleswitch.KeywordsDipCoating,DCmotor,L293DDriverCircuit,Programmable1.ogiccontroller(PLC),Computer,SlideandVessel1. INTRODUCTIONWiththerapidchangesonindustriesandinformationtechnologiesinrecentyears,sometraditionalbulkelectronicapplianceshavetobemonitoredforalongtime.AlloftheircontroldevicessuchascommunicationinterfacesgraduallyentertheInternetinformationera.Controlofallequipmentshasbeenperformedthroughtheuseofcomputers.MostequipmentusesPLC(Programmablelogiccontroller)toconnectwithcomputertomonitorconsumingdevices.PLC,sarewidelyusedinindustrialfieldsbecausetheyareinexpensive,easytoinstallandveryflexibleinapplications.APLCinteractswiththeexternalworldthroughitsinputsandoutputs.Sincetechnologyformotioncontrolofcircuitdrivesbecameavailable,theuseofPLCwithpowerelectronicsinelectricmachineapplicationshasbeenintroducedinthemanufacturingautomation1.Dipcoatersarerobustcomputercontrolledinstrumentsforprecisethinfilmdeposition.Weprovidesolutionsforthedipcoatingofsmalltolargesamplesineithersingleormultiplevesselswhichissuitableforbothsimpleandcomplexvesselsequencing2.Sincetechnologyformotioncontrolofelectricdrivesbecameavailable,theuseofPLC,swithpowerelectronicsinelectricmachinesapplicationshasbeenintroducedinthemanufacturingautomation13&4.ManyapplicationsofDCmotorsrequirebesidesthemotorcontrolfunctionality,thehandlingofseveralspecificanaloganddigitalinput/outputsignals,homesignals,forwardcommand,reversecommandsandon/off5.Insuchcases,acontrolunitinvolvingaPLCmustbeaddedtothesystemstructure.ThispaperpresentsaPLC-basedmonitoringandcontrolsystemforDipCoating.Itdescribesthedesignandimplementationoftheconfiguredhardwareandsoftware.ThetestresultsobtainedonDCmotorperformanceshowimprovedefficiencyandincreasedaccuracyintimeconstantcontrolledoperation.Thus,thePLCcorrelatesandcontrolstheoperationalparameterstothetimesetpointrequestedbytheuserandmonitorstheDCmotorsystemduringmanualoperationandunderautomaticconditions.2. PLCASASYSTEMCONTROLLERPLCisamicroprocessor-basedcontrolsystem,designedforautomationprocessesinindustrialenvironments.ItusesaprogrammablememoryfortheinternalstorageofUserorientatedinstructionsforimplementingspecificfunctionssuchasarithmetic,counting,logic,sequencing,andtiming6&7.APLCcanbeprogrammedtosense,activateandcontrolindustrialequipment,incorporatesanumberofI/Opoints,whichallowelectricalsignalstobeinterfaced.InputdevicesandoutputdevicesoftheprocessareconnectedtothePLCandthecontrolprogramisenteredintothePLCmemory(Fig1).Inourapplication,itcontrolsthroughanalog/digitalinputsandoutputsthevaryingload-constantspeedoperationofaninductionmotor.Also,thePLCcontinuouslymonitorstheinputsandactivatestheoutputsaccordingtothecontrolprogram.ThisPLCsystemisofmodulartypecomposedofspecifichardwarebuildingblocks(modules),whichplugdirectlyintoaproprietarybus:acentralprocessorunit(CPU),apowersupplyunit,input-outputmodulesI/Oandaprogramterminal.Suchamodularapproachhastheadvantagethattheinitialconfigurationcanbeexpandedforotherfutureapplicationssuchasmultimachinesystemsorcomputerlinking8.3. CONTROLSYSTEMOFDIPCOATINGMODULEThefollowingconfigurationscanbeobtainedfromthissetup.PLC,sprogrammingisbasedonthelogicdemandsofinputdevicesandtheprogramsimplementedarepredominantlylogicalratherthannumericalcomputationalalgorithms.Theprogrammedoperationsworkonastraighttwo-statettforwardandreverse“basisandthesealternatepossibilitiescorrespondto''positivepolarityornegativepolarity(logicalform)i.e."+12Vor-12v''respectively.In(Fig2),theblockdiagramoftheexperimentalsystemisillustrated.Thefollowingconfigurationcanbeobtainedfromthissetup.A. Personalcomputerformonitoringthestatusofdipcoating.B. PLC-programmablelogiccontrollerisprogrammedwithladderdiagramandcommunicateswithPCthroughRS2329.C. AC230V,50HzconverttoDCPowersupply,simultaneouslygives24V-12AMPSforPLC,12Vand5V12AMPSforL293ddrivertooperatethefunction(SMPS)10&11.D. CircuitboardcontainsL293DPCB(Printedcircuitboard)designalongwithcontrollerswitchtooperateautoandmanual12&13.E. Dipcoatingmodelhas12,×12,*squaresteelsheet,12"rod,10"angle,2numbersofslideclamperandvesselsclampers.F. TheautomaticprocesscanbecontrolledthesystemofDipcoatingmodulebyAutoandManualsswitchareplacedinbuiltinthecircuitboard.4. HARDWAREDESCRIP