畢業(yè)論文外文翻譯--基于plc應(yīng)用的監(jiān)控平臺(tái)的發(fā)展

1、附錄附錄1外文原文DevelopmentofamonitingcontrolplatfmfPLCbasedapplicationsS.DanaA.SagahyroonA.ElrayesA.R.AlAliR.AlAydi1.IntroductionTherecentgrowthofwkstechnologyspeciallythewidespreadoftheInterhavepromotedthedevelopmentofdistrib

2、utedmeasurementsystemsfavarietyofindustrialapplications.Thesedistributedmeasurementsystemscanbeusedinthemonitingcontrolofvariousinstrumentsinthewk[12].AProgrammableLogicController(PLC)ismicroprocessbasedcontrolsystemthat

3、canbeprogrammedtosenseactivatecontrolindustrialequipmenttherefeincpatesanumberofinputoutputterminalsfinterfacingtoanindustrialprocess.AcontrolprogramstedinthePLCmemydeterminestherelationshipbetweentheinputsoutputsofthePL

4、C.PLCsareintelligentautomationstationsthatpossesshighlyusefuldesirablefeaturessuchas[3]:?Robustness.?Highdegreeofscalability:modernPLCfamilieshaveawidespectrumofCPUtypesthatallowseasyscalabilityinfunctionalityperfmance.?

5、Extensibility:themodulardesignofPLCsenablestheextensionwithawiderangeofdigitalanalogIOmodules.Alsovariousintegratedtechnologymodulesareavailablefvariousapplicationareas.?Sophisticatedcommunicationcapabilities:modernPLCsh

6、avecommunicationptsthatprovidefcentralizeddistributedconnectivity.?Powerfuldevelopmentenvironment:modernPLCfamiliescomewithacrossdevelopmentenvironmentthatsupptdifferentlanguagesfprogrammabilityallowssemigraphicalhardwar

7、econfigurationofferstrongdebuggingmechanisms.Remoteaccesstocontrolmonitvariousdevicesinanindustrialsettingisofvaluetoengineersautomationfacilities.CurrentimplementationsofremotePLCmonitcontrolusededicatedPCswebserverscon

8、nectedtothePLC.Fig.1illustratesacommonarchitectureusedinindustry.AsshownPLCsareconnectedtothewkthroughacomputer.ThePLCsystemisusuallyinterfacedtothiscomputerusingtheserialPtProfibus.Thesetypesofsystemsaredisadvantagedbyt

9、hededicateduseofaPCtoaccessthePLCsystem.Thearchitecturealsodoesnotmakeuseoftheadventsstridesmadeinareassuchastelecommunicationswebtechnology.Fig.2.SystemarchitectureThesystemconsistsofthefollowingcomponents:?SimaticS7200

10、300PLCsystemsCommunicationProcesss(CPs).EachCPhasanintegratedcommunicationinterface(hardwaresoftware)thatallowsthePLCtocommunicateinaLANWANviaaGSMwk.?Clientsadministratareconnectedtotheprocessviathewk(wirelessly).Privile

11、gescanbesetresetbyadministratstoallowftolimitthevariousclientsoptions.?ADatabaseServerconnectedtotheprocessviathewkfdataloggingeventrecding.?AvarietyofwkoptionsincludingGSMbasedaccessibility.ThePLCsystemEthermoduleisacom

12、municationprocessftheS7familyusedtoconnectthePLCtothewk.AnadditionalcommunicationprocessisusedtoallowcommunicationbetweenthePLCtheGSMmodemovertheserialpt(RS232).IntheproposedimplementationthePLCsystemreptsremotelythestat

13、usoftheprocesstotheDatabaseServer.TheDatabaseServerrecdsthestatusofthePLCintimebasedtablesperfmsanyrequireddataanalysis.Thesystemalsoreceivesexecutescommandsfromadministratsclientstocontroltheprocess.GSMconnectivityisals

14、oimplementedtoallowuserswithdifferentprivilegestoaccessthestatusofthemandatyfunctionsofthePLCallowthemtocontrolthesefunctions.EtherGSMconnectivityofthePLCsisimplementedusingtheCP343theCP340communicationprocesss[7].TheSys

15、temsoftwarewasimplementedmainlyusingSimaticManager[7]Java.TheSimaticManagerenvironmentisusedfcommunicationwiththePLCsystem.Theproposedarchitectureallowsfprogrammingreprogrammingconfiguringthesystemremotely.TheJavaapplica

16、tionisdevelopedusingtheS7APIs(S7ApplicationProgrammingInterfaces)toestablishthecommunicationbetweentheDatabaseServerPLCstation[8].FexampleusingtheseAPIswecaninstantiateobjectsthatwillconnecttheDatabaseServertothePLCstati