电子信息工程 外文翻译 外文文献 英文文献 文献翻译.docx

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TechnologyandApplicationofFieldbusControlSystem---IntelligentEquipment&MeasurementAndControlSystemBasedonDeviceNet

Promotedbythenewtechnologicalrevolutionthatautomationcontroltechnologyistendingdigitizationandinternetinthefieldofautomationindustry,ShanghaiAtonElectricCo.,Ltd.developedIntelligentEquipment&MeasurementAndControlSystemBasedonDeviceNetasahighandnewtechnologyindustrializationmodelproject.Itwasastatehi-techdevelopmentprojectof2000andwasapprovedbytheStateCommitteeofTechnology.ShanghaiAtonElectricCo.,Ltd.constructedproductionlineofintelligentcontrollerofpumpandvalve,relyingonShanghaiElectric（Group）Corporation;constructedmeasurementandcontrolsystemFCSR&DcenterofintelligentcontrollerofpumpandvalveandbuiltupmassproductionR&Dbasis,cooperatingwithShanghaiJiaotongUniversityandShanghaiUniversity;constructedFCSremotediagnosisandservicecenterofintelligentcontrollerofpumpandvalve;constructedFCStrainingcenterofintelligentcontrollerofpumpandvalve;foundedmassproductionR&DbasisalongwiththeRockwellLaboratoryofShanghaiJiaotongUniversityandCIMSCenter.

1Summary

（1）Fieldbuscontrolsystemisasystemappliedtofieldofproductionandmicrocomputerizedmeasurementcontrolequipmenttorealizeboth-waymultinodeserialcommunications.Itisalsocalledlow-levelcontrolnetworkforopen,digitalandmultiplespotcommunications.

Application:

FlowControlSystemofManufacturing;ProcessControlSystem;TrafficControl&Management;BuildingAutomation. Features:

Fieldbuscontrolsystemislow-levellow-bandwidthdigitalcommunicationandcontrolnetworkinindustrialsystemaswellasopensystemconnectingmicrocomputerizedappearance.Intelligentinstrumentandcontrollerareequaltomicrocomputer.TheymakeupnetworkwithFieldbuscontrolsystemasthelinkstocompletedigitalcommunicationandothertasks.

（2）DifferencebetweenFCSandDCS,FCSisupdatedcontrolsystemafterDCSintegratedwithdigitalcontrolsystemanddistributingcontrolsystem.ItsolvestheproblemthatintraditionalDCS,devicesmadebydifferentmanufacturerscannotbeconnected.Theycan'trealizeexchangeandoperationtoorganizeannetworksystemwithwiderrangeofinformationsharing.ItconquersthedefectthatspecialclosedsystemfornetworkshouldbeusedforcommunicationinDCStorealizevariousfunctionsofintegratedautomation.Itturnsthedistributingstructurecombining

concentrationwithdeconcentrationinDCSintonew-typefulldistributingstructure.Itreleasesthecontrolfunctiontothefieldthoroughlyandmakesitpossibletorealizebasiccontrolfunctionbymeansoffieldbusequipmentitself.FCSbreaksthetraditionalstructureformofcontrolsystem.Thetraditionalanalogcontrolsystemadoptsone-to-oneequipmenttie-wireandputsupconnectionsrespectivelyaccordingtocontrolloop.FCSadoptsintelligentfieldequipmenttoplacethecontrolmodule,allinput/outputmodulesthatusedtobeinthecontrolchamberofDCSintofieldequipment.Sincefieldequipmenthasabilitytocommunicate,thefieldmeasuringandtransferringinstrumentscantransfersignalstoactuatingmechanismsuchasvalvedirectly.Itscontrolfunctioncanbefulfilleddirectlyonthespotindependentofthecomputerorcontrolmeterinthecontrolchamber,whichrealizesthoroughdecentralizedcontrol.

FCSadoptsdigitalsignalstoreplaceanalogsignalssothatmultiplesignals（includingmultipleoperatingparametervalues,devicestatusandfailureinformation）canbetransferredonapairofcables.Meanwhile,itcangivepowersupplytoseveraldevices.Noswitchedblockforanalog/digitalordigital/analogisneededbesidesfieldbus.

（3）CharacteristicsofFCS

●OpenSystem;

●Interoperability;

●replaceabilityofdevicesmadebydifferentmanufacturers.

●IntelligentizeandAutonomy;

●Fieldequipmentcompletingbasicfunctionsofautomaticcontrol.

●DecentralizedSystemStructure;

●FieldAdaptability;

●RelativelyStrongInterferenceKillingFeatureandSafety

●Intelligentizedlocalequipmentcansaveinvestmentandquantityofhardware

●Savinginstallationexpensesandcables

●Savingdailymaintenanceexpenses

●Enhancingaccuracyandreliabilityofsystem

●Enhancinginitiativenessofsystemintegrationforusers

（4）DevelopmentBackgroundandTrendofFieldbusControlSystem,Withtherapiddevelopmentofcomputerandcomputernetwork,FCShasbeenrapidlydevelopedastheinterlinkedcommunicationnetworkbetweenthefieldintelligent

devicesinthefieldofprocessautomation,buildingandtrafficetc.BecauseFCSmeetstheneedsthatindustrialcontrolsystemisdevelopinginthewayofdecentralization,networkandintellectualized,ithasbecomethefocusofglobalindustrialautomationandbeenuniversally concernedbythewholeworld.FCShascausedgreatrevolutionsontheaspectsofsystemstructureandfunctionsystemforthecurrentproductionofautomationinstrument,distributingcontrolsystemandprogrammablecontroller.ItispredictedthatFCSwillbethegeneraltrendsinaverylongtimeinthefutureforesure.

2APPLICATIONOFRELAY

Theproductreliabilitygenerallyreferstotheoperatingreliability.Itisdefinedas:

theabilityofaccomplishingthespecifiedfunctionunderprescribedconditionsandinprescribedtime.Itconsistsofintrinsicreliabilityandapplicationreliability.Theintrinsicreliabilityisdeterminedbyproductdesigningandmanufacturingtechnique,andtheapplicationreliabilityisconcernedwiththecorrectapplicationofusersandtheservicesprovidedbythemanufacturerbeforeandafterselling.Whenusingrelay,theusershouldpayattentiontothefollowingitems.

2.1Coilappliedvoltage

Itisbesttochoosethecoilapplicativevoltageaccordingtotheratedvoltageindesign,orchoosethevoltageaccordingtothetemperaturerisingcurve.Usinganycoilvoltagethatislessthantheratedvoltagewillaffecttheoperationoftherelay.Thecoiloperatingvoltagereferstothevoltagethatisappliedbetweenthecoilterminals.

Thevoltagevaluebetweenthetwoterminalsmustbeguaranteed,especiallywhenusingenlargementcircuittoenergizethecoil.Whereas,itwillalsoaffecttherelaycharacteristicsiftheappliedvoltageexceedsthehighestratedvoltage.Exorbitantvoltagewillbringexorbitantcoiltemperaturerising,especiallyinhightemperatureambient.Exorbitanttemperaturerisingwilldamagetheinsulatingmaterialandaffecttheworkingsafetyofrelay.Formagneticlatchingrelay,energizing（orreturn）pulsewidthshouldnotlessthan3timesoftheoperating（orreturn）time,otherwise,therelaywouldbeleftonthemiddle-positionstate.Whenusingsolid-statecomponentstoenergizethecoil,thecomponentsdielectricstrengthmustbeabove80V ,andtheleakageofcurrentmustbeaslittleaspossibletoensuretherelaytorelease.

Energizingpowersource:

Under110%oftheratedcurrent,theadjustingratioofthepowersourceislessthan10%（ortheoutputimpedanceislessthan5%ofthecoil

impedance）,thewavevoltageoftheDCpowersourceislessthan5%.TheACwaveissinewave;thewavinesscoefficientisbetween0.95~1.25;wavedistortioniswithin

±10%;thefrequencychangeiswithin±1Hzor±1%ofthespecifiedfrequency（choosingthebiggervalue）.Theoutputpowershouldnotlessthancoilpowerconsumption.

2.2Transientsuppression

Atthemomentwhenthecoilpowerisstopped,peak-inversevoltagethatismorethan30timesofthecoilratedvoltageisproducedonthecoil,whichisharmfultotheelectroniccircuit.Generally,thepeak-inversevoltageissuppressedbytransient

suppression（cutting-peak）diodeorresistancetolimitthepeak-inversevoltagewithin50V.Butthediodeinparallelconnectionwilldelay3~5timesofthereleasetime.Iftherequestofthereleasetimeishigh,asuitableresistanceinseriescanbeputtedwithandatoneendofthediode.Thepowersupplytorelaysinparallelconnectionandseriesconnection,Whenseveralrelaysinparallelconnectionaresupplied,therelaythatthepeak-inversevoltageishigherwillreleasepowertotherelaysthatthepeak-inversevoltageislower.Thereleasetimeoftherelaywilldelay.Sotherelaysinparallelconnectionshouldbecontrolledseparatelytoeliminate

mutualinfluence.

Therelayswithdifferentcoilresistanceandpowercan’tbeusedinseries,otherwise,therelaythatthecoilcurrentis higherintheseriescircuitcan’toperatereliably.Onlytherelaysofthesamespecificationcanbeusedinseries,butthepeak-inversevoltagewillbeincreasedandthepeak-inversevoltageshouldbesuppressed.Resistanceinseriescanbeusedtobearthepartvoltagethatexceedstheratedvoltageofthecoilaccordingtotheratioofthedividedvoltage.

2.2.1Contactload

Theloadappliedtothecontactsshouldbeaccordanttotheratedloadandcharacteristicsofthecontacts.Aloadthatisnotappliedaccordingtotheratedvaluerangewillcauseproblem.TherelaythatisonlysuitableforDCloadcan’tbeusedinACoccasions.Therelaythatcanswitch10Aloadcan’talwaysreliablyoperateinlowlevelload（lessthan10mA×6A）orindrycircuitoccasions.Therelaythatcanswitchsingle-phaseACpowersourceisn’talwayssuitabletoswitchtwosingle-phaseACloadsthataren’tsynchronous;therelaythatisonlyspecifiedtoswitchtheloadofAC50Hz（or60Hz）can’tbeusedtoswitchACloadof400Hz.

2.2.2Parallelandseriesconnectionofcontacts

Thecontactsusedinparallelconnectioncan’tincreasetheloadcurrent,becausetheoperatingtimesofseveralsetsofcontac