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1、主流实时以太网技术的比较（Comparisonofmainstreamreal-timeEthernettechnologies）mainMainmainstreamStreamsolidRealtimeFromtimetotimeAetherMrs.netNetworktechnologyTechnologyOperativeRatioofCompareMorethanSummaryofeachreal-timeEthernetTechnologySummay,of,different,RT-Ethernet,tehcnol
2、ogiesAtpresent,industrialrealtimeEthernettechnologyisboomingandisreplacingthetraditionalfieldbustechnology(Profibus,CAN,Interbus,Fieldbus,DeviceNet,Modbus)marketsTherearemanyreal-timecommunicationtechnologies,andthispapercomparesthem.Thesereal-timeEthernetarebasedon
3、TheuScycleisnotincludedinthecyclecycleModBus,TCP/IP,EthernetTCP/IPtheseMSclasscommunicationstechnology,andalsodoesnotincludenonmainstreamEthernettechnology,justinthefieldofreal-timeEthernetcomparison(followedbyreal-timeEthernethere)INONA'sreal-timeclassificationleve
4、l.Itshouldbestatedthatthisarticleprovidesonlyapanoramicoverview,ratherthanatendentiousdescription,whichaimstoanalyzethecharacteristicsofvarioustechnologiesobjectivelyandimpartiallyinordertocommunicatewitheachotherInordertoselectthereferenceofnetworktechnology.1.1Pro
5、fiNetIRTProfiNetprovidesthreedifferentversions,dependingonitsimplementationandreal-timesupportfortheapplicationProfiNet/Cba,ProfiNet,RT,ProfiNet,IRT,amongthemProfiNet/CbaisbuilttandatOnthebasisofSoftIP,theswitchconnectionmodeisadopted.Becauseofthetimedelaycausedbyth
6、eswitch,thefastsynchronizationspeedcannotbesupported,andtheProfiNetdoesnothaveveryhighrealtimeTiming,whileRTcannotmeettheneedsofhigh-speedmotioncontrol,howeverProfiNetIRTisdesignedforfastermotioncontrolapplications,soadedicatedchipisusedtoachievethisSothatitsspeedha
7、sbeengreatlyimproved,youcanachieve100servos100uSdatarefreshcapability,systemjitterfor1uS.atpresentProfinethasstartedtousealot,andProfiNetIRThasyettobeofficiallyusedinlargenumbers1.2EthernetPOWERLINKPollingmodeisadoptedbythemasterstationMNandCNconstitutedbythesystemS
8、oCstartstheisochronousisochronoustransferbythemasterstationforeachCNallocatesfixedtimeslotsthroughthismechanismtoimplementrealityDataexcha
