外文翻译PLC在冰蓄冷中央空调系统控制中的应用.docx
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外文翻译PLC在冰蓄冷中央空调系统控制中的应用.docx
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外文翻译PLC在冰蓄冷中央空调系统控制中的应用
PLCintheicestoragecentralair-conditioningsystemofcontrol
1Introduction
InPLCin30yearswhichdeveloped,itpassesthroughdevelopsunceasingly,alreadycouldunifysimulatesI/O,thenetworkcorrespondsaswellasusesnewprogrammingstandardlikeIEC61131-3.However,engineersonlymustusedigitalI/OandfewsimulationsI/Onumberaswellassimpleprogrammingskillonpotential80%industrialapplication.
PLChasbeenwidelyusedinallindustrialsectors.Accordingto"TheUnitedStatesmarketinformation"WorldPLCandsoftwaremarketreport,in1995theglobalsoftwarePLCanditseconomiesofscaleofabout5billionUSdollars[5].Aselectronictechnologyandthedevelopmentofcomputertechnology,
Becauseusestraditionalthetooltobepossibletosolve80%industrialapplication,likethisintenselyneedstohavelowcostsimplePLC;ThuspromotedthelowcostminiaturePLCgrowth,ithastheusefultrapezoidallogicalprogrammingdigitalI/O.However,thishasalsocreatedthediscontinuityinthecontroltechnology,ontheonehand80%applicationneedtousethesimplelowcostcontroller,butontheotherhandother20%applicationthenhavesurpassedthefunctionwhichthetraditioncontrolsystemcanprovide.Engineerisdevelopingthese20%applicationtoneedtohavethehighercirculationspeed,theseniorcontrolalgorithm,themoresimulationsfunctionaswellascanwellandtheenterprisenetworkintegration.
In80andthe90's,thesemustdevelop"20%application"engineershadconsideredusesPCintheindustrycontrol.PCprovidesthesoftwarefunctionmaycarryouttheseniortask,providestherichprogrammingandtheuserenvironment,andthePCCOTSpartenablescontrolengineerthetechnologywhichdevelopsunceasinglytouseinotherapplications.Thesetechnologiesincludingfloatingpointprocessor;HighspeedI/Omainline,likePCIandethernet;Fixeddatamemory;softwaredevelopmentkit.MoreoverPCalsocanprovidetheincomparableflexibility,highlyeffectivesoftwareaswellasseniorlowcosthardware.
Icethermalstorageairconditioningisthecentralpowergridcouldberedundant-nighticeelectricityintheformofcoldstorage,inthedaytimepeakhoursofelectricitytoprovideair-conditioningservicesmeltingice.Asmostpartsofourcountryatnightthanduringthedaymuchlowerprice,usingicecoldstoragecentralair-conditioningcangreatlyreduceuseroperatingcosts.
Icestoragecentralair-conditioningsystemconfigurationofequipmentthanconventionalairconditioningsystemtoincreasesome,requireahigherdegreeofautomation,butitautomaticallytomeettherequirementsoftheair-conditionedbuildingsalldayeverydayundertheconditionsoftheenergyhehasexhaustedall,thebiggestlimitstosaveoperatingcosts.
thePLCfunctionsaregreatlyenhanced,withthefollowingcharacteristics:
(1)highreliability.PLCbenefitedfromthehigh-reliabilityhardwareandsoftwareonaseriesofanti-jammingmeasuresandthecycleofitsspecialscanningmethodsofwork.
(2)withrichI/Ointerfacemodule.PLCfordifferentindustrialfieldsignalandthecorrespondingI/Omodulesandindustrialdevicesorequipmentatthesceneofadirectconnection.Inadditiontoimprovingperformance,italsohasavarietyofman-machinedialogueinterfacemodulestotheindustrialcompositionoflocalareanetworks,italsomultiplecommunicationsnetworkinterfacemodule.
(3)modularstructure.Tomeettheneedsofvariousindustrialcontrol,inadditiontoasmallPLCunit,thevastmajorityofPLCaremodularstructure.PLCvariouscomponents,includingtheCPU,powersupply,I/O,etc.ismodularindesignfromtherackandcableswillconnecteachmodule,thesystem'ssizeandfunctioninaccordancewiththeneedsofusersofitsownportfolio.
(4)easytolearnprogramming.MostofthePLCprogrammingrelaycontrolcircuitsimilartotheladderdiagramform,theuser,donothavecomputerexpertise,itiseasytogeneralengineeringandtechnicalpersonnelunderstandandmaster.
(5)Installationissimpleandeasymaintenance.PLCdoesnotrequirespecializedequipmentroominavarietyofindustrialenvironmentscanbedirectlyrun.Variousmodulesarerunandfaultindicationdevices,user-friendlyunderstandingoftheoperationandfindfault.Themodularstructure,soanyfailureofamodule,userscanreplacethemodule,allowingthesystemtorapidlyresumeoperation.
Second,thecharacteristicsandApplicationofindustrialPC
2controlsystem
Thecontrolsystemconsistsofthecrew(FloorControlWorkstation)andPC(centralmanagementworkstation),withthecrewusingprogrammablelogiccontroller(PLC)withthetouchscreen,PCusingindustrial-gradecomputersandprinters,systemconfigurationnecessaryiftheannexcommunicationsequipmentinterfaces,networkinterfacecards,modemsandsoon,toachievetheparametersofthestoragesystemandintelligentautomaticoperation.
Underthecrewatthesceneandtouch-screensystemscancontrol,parametersettingsanddata.PCremotemanagementandprint,itcontainsthecrewandallofthefeaturestouchscreen.Followingthesystemasawholecrewofindustrialprogrammablelogiccontrollerasthecore,toachieveautomaticcontrol.Controlequipmentanddevicesincluding:
detectionsensorcomponents,electricvalves,converter,etc..
Underthe2.1-Systems(Regionalworkstations)
2.1.1TP21touchscreen
TP27usedasacolortouch-screenoperatorpanel,completelyreplaceconventionalbutton,lightsdevice,thecontrolcabinetinterviewedmoretidy.Moreover,TP27touchscreenatthesceneshowedthatthestatecanberealized,systemsettings,modeselection,parametersetting,faultrecording,recordload,time-of-day,real-timedata,loadcurveandreportingstatistics,andotherfunctions,Chineseintuitiveandfriendlyuserinterface.
2.1.2SIEMENSPLC
SIMATICS7-300SeriesPLCappliedtoallwalksoflife,allkindsofoccasionsinthedetection,monitoringandcontrolautomation,itspowerfulfeaturestobothoperateindependently,orlinkedtoanetworkabletoachievecomplexcontrolfunctions.
Theproductfeaturesphotoelectricisolation,andhighelectromagneticcompatibility;highindustrialapplicability,allowingtheambienttemperatureof60℃;hasastronganti-jammingandanti-vibrationandimpactresistance,intheharshenvironmentoftheworkhasbeenwidelyapplications.
IalsomeansfreedomofcommunicationsS7-300PLC,averyuniquefeatures,itmakesS7-300PLCwithanycommunicationprotocolcanopenotherequipment,communicationscontroller,orPLCS7-300canbedefinedbytheusersthemselvescommunicationsprotocols(forexampleASCIIprotocol),baudrateof1.5Mbit/s(adjustable).Thusthescopeofthecommunicationscanbegreatlyincreased,thecontrolsystemconfigurationmoreflexibleandconvenient.Anyserialinterfacewithperipherals,suchas:
printerorbarcodereaders,thedrive,amodem(Modem),theupperPCcanbeconnectedtothemachine.Userscanprogramtodevelopcommunicationprotocoltoexchangedata(suchas:
ASCIIcharactercode),RS232interfacewiththeequipmentavailablePC/PPIfreecablelinkingcommunicationscommunication.
ChipandChipHolders
lntegratedCircuisareusuallycalledIcsorchips.Thayarecomplexcircuits,whichhavebennetchedontotinychipsofsemiconductor(silicon).Thechipispackagedinaplasticholderwithpinsspacedona0.1(2.54mm)grid,whichwillfittheholesonstipboard.Veryfinewiresinisdethepackagelinkthechiptothepins.
1)Pinnumbers
Thepinsarenumberedanti-clockwisearoundtheIC(chip)startingnearthenotchordot.Itshowsthenumberingfor8-pinand14-pinIcs,buttheprincipleisthesameforallsizes.
2)Chipholders(DILsockets)
ICs(chip)areeasilydamagededbyheatwhensolderingandtheirshortpinscannotbeprotectedwithaheatsink.Insteadweuseachipholder,strictlycalledaDILsocket(DIL=DualIn-Line),whichcanbesafelysolderedontothecircuitboard.Thechipispushedintotheholderwhenallsoldingiscomplete.
Chipholdersareonlyneddedwhensoldingsotheyarenotusedonbreaboards.
Commerciallyproducedcircuitboardsoftenhavechipssoldereddirectlytotheboardwithoutachipholder,usuallythisisdonebyamachinewhichisabletoworkveryquickly.Pleasedonnotattemptodothisyourselfbecauseyouarelikelytodestorythechipanditwillbedifferenttoremovewithoutdamagebyde-soldering.
3)Removingachipfromitsholder
4)Ifyouneedtoremoveachipitcanbegentlyprizedoutoftheholderwithasmallflat-bladescrewdriver.Carefullyleverupeachendbyinsertingthescrewdriverbladebetweenthechipanditsholderandgentlytwistingthescrewdrive.Takecaretostatreliftingatbothendsbeforeyouattempttoremovethechip,otherwiseyouwillbendandpossiblybreakthepins.
5)BipolarIntegratedCircuitsMOSIntegratedCircuits
Historically,bipolarIntegratedCircuitsusedtobemuchmorepopularthanMOSIntegratedCircuits,particularlyforsmall-sacelogicCircuits.Thereweretwomajorreasonsforthis:
first,bipolar-junctiontransistorsoriginallycouldbemanufacturedmorereliablythanMOStransistors,andsecond,theywerefaster,AsthereliabitityofMOStransistorsimproved,andasintegratedCircuitsbecamemorecomplex,whichmadethelowerpowerandsmallsizeofMOSlogicmoreimportant,thepopularityofBJTlogicdecreased,however,BJTtechnologyisstillpopularforthehighestfrequencylogiccircuits.
WhenthePCoffline,underthecontrolofthenextcrew,theentiresystemcanoperatenormally.
PCSystem2.2(centralmanagementworkstation)
PC2.2.1
PCthatisbyc
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