外文翻译 基于现场总线监测系统的PLC控制制造系统.doc

《外文翻译 基于现场总线监测系统的PLC控制制造系统.doc》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、AMonitoringSystemForPLCControlledManufacturingSystemBasedOnFieldbus1.IntroductionThewindingvacuumsystemsforplatingmetalsuchaszincandaluminiumonthinfilmareverycommoninthecapacitanceindustry.Themaingoalistoincreaseasmuchaspossiblethefilmtransportvelocitywhilecontrollingthete

2、nsionofthefilm.Thetensionandthespeedofthefilmshouldbemaintainedatareferencevalue.Themainconcernisthecouplingexistingbetweenfilmvelocityandtension.Thereexistmanysourcesofdisturbancesonthevelocity(rollernon・circularity,filmsliding).Ifthedeliveryspeedfluctuates,thenthetreatme

3、ntonthefilmbecomesnonuniform.Ontheotherhandinappropriatetensionmaycausewrinklesorevenafilmbreak.Oncefilmbreaktakesplace,theoperatorneedsopenthewindingchamberagain.Obviouslythepressureofwindingchambercomesbacktostandardatmospherepressure.Anditwilltakeabout20-30minutesforwin

4、dingchambertoreachtherequiredpressure.Accordinglytheoutputwilldecreaseevidently.Soamonitoringsystemtomonitortensionfluctuationinordertoavoidfilmbreakisveryneedful.CC-Linkisafieldnetworksystemthatprocessesbothcontrolandinformationdataathighspeed,toprovideefficient,integrate

5、dfactoryandprocessautomation.UsingCC-Linkenablesuserstoreducetheamountofcontrolandpowerwiringrequiredinthecomplicatedproductionline.Sinceuserscanselectthesuitabledevicesfrommorethan354fielddevicessupportedCC-Linkitiseasytoexpandmulti-vendorenvironment.Asforthecommunication

6、ofspeed,thisenablesthecommunicationwiththesensorinputwhichrequiresahighspeedresponseandintelligentdeviceswhichrequiresalargeamountofdatacommunication.AsoneofCC-Linksfeatures,RASfunctionssuchas,stand-bymasterfunction,detachingslavestationfunctionandautoreturnfunctionenabler

7、ecoveryfromthecommunicationfaultandthesystemdebugatstartuptime.Asfortestandmonitoringfunction,confirmationofthedatalinkstatus,hardwaretestandcircuittestareavailable.TheCC-LinknetworkdiagramisshownasFig.1.TheCC-Linkmonitoringsystemiscomposedofmasterstation>slavestations>per

8、sonalcomputer>inverter>servomotors>remoteI/Ounits,ect.Inordertomeetthequestforautomationa