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TechnologyandApplicationofFieldbusControlSystem Intelligent
Equipment&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.Theycantrealizeexchangeandoperationtoorganizeannetworksystemwithwiderrangeofinformationsharing.ItconquersthedefectthatspecialclosedsystemfornetworkshouldbeusedforcommunicationinDCStorealizevariousfunctionsofintegratedautomation.ItturnsthedistributingstructurecombiningconcentrationwithdeconcentrationinDCSintonew-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,FCShasbeenrapidlydevelopedastheinterlinkedcommunicationnetworkbetweenthefieldintelligentdevicesinthefieldofprocessautomation,buildingandtrafficetc.BecauseFCSmeetstheneedsthatindustrialcontrolsystemisdevelopinginthewayofdecentralization,networkandintellectualized,ithasbecomethefocusofglobalindustrialautomationandbeenuniversallyconcernedbythewholeworld.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%ofthecoilimpedance),thewavevoltageoftheDCpowersourceislessthan5%.TheACwaveissinewave;thewavinesscoefficientisbetween0.95〜1.25;wavedistortioniswithin±10%;thefrequencychangeiswithin±lHzor±1%ofthespecifiedfrequency(choosingthebiggervalue).Theoutputpowershouldnotlessthancoilpowerconsumption.
2.2Transientsuppression
Atthemomentwhenthecoilpowerisstopped,peak-inversevoltagethatismorethan30timesofthecoilratedvoltageisproducedonthecoil,whichisharmfultotheelectroniccircuit.Generally,thepeak-inversevoltageissuppressedbytransientsuppression(cutting-peak)diodeorresistancetolimitthepeak-inversevoltagewithin50V.Butthediodeinparallelconnectionwilldelay3-5timesofthereleasetime.Iftherequestofthereleasetimeishigh,asuitableresistanceinseriescanbeputtedwithandatoneendofthediode.Thepowersupplytorelaysinparallelconnectionandseriesconnection,Whenseveralrelaysinparallelconnectionaresupplied,therelaythatthepeak-inversevoltageishigherwillreleasepowertotherelaysthatthepeak-inversevoltageislower.Thereleasetimeoftherelaywilldelay.Sotherelaysinparallelconnectionshouldbecontrolledseparatelytoeliminatemutualinfluence.
Therelayswithdifferentcoilresistanceandpowercan'tbeusedinseries,otherwise,therelaythatthecoilcurrentishigherintheseriescircuitcan'toperatereliably.Onlytherelaysofthesamespecificationcanbeusedinseries,butthepeak-inversevoltagewillbeincreasedandthepeak-inversevoltageshouldbesuppressed.Resistanceinseriescanbeusedtobearthepartvoltagethatexceedstheratedvoltageofthecoilaccordingtotheratioofthedividedvoltage.
2.2.1Contactload
Theloadappliedtothecontactsshouldbeaccordanttotheratedloadandcharacteristicsofthecontacts.Aloadthatisnotappliedaccordingtotheratedvaluerangewillcauseproblem.TherelaythatisonlysuitableforDCloadcan'tbeusedinACoccasions.Therelaythatcanswitch10Aloadcan'talwaysreliablyoperateinlowlevelload(lessthan10mAx6A)orindrycircuitoccasions.Therelaythatcanswitchsingle-phaseACpowersourceisn'talwayssuitabletoswitchtwosingle-phaseACloadsthataren'tsynchronous;therelaythatisonlyspecifiedtoswitchtheloadofAC50Hz(or60Hz)can'tbeusedtoswitchACloadof400Hz.
2.2.2Parallelandseriesconnectionofcontacts
Thecontactsusedinparallelconnectioncan'tincreasetheloadcurrent,becausetheoperatingtimesofseveralsetsofcontactsareabsolutelydifferent;thatistosay,thereisstill