Piggin-06EthernetIP - Control in real time

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1、Ethernet/IPEtherNet/IP,where‘IP’standsfor‘IndustrialProtocol’SYNCHRONISATIONWITHSTANDARDistheCIPadaptation(ODVAandCI)thatrunsoverTCP/IP,ETHERNETThegrowthandthereforeanysupporteddatalinkandphysicallayers,CIPSyncenablessynchronouslowjittersystemreactionsthemostpopularofwhichisIEEE802.

2、3,commonlyknownwithouttheneedforlowjitterdatatransmission.ThisisofofEthernet/asEthernet.TheoverallrelationshipbetweenthethreeCIPgreatimportanceinsystemsthatdonotprovideabsoluteIPisinpartimplementationsandtheISO/OSI7-layermodelisshowndeterministicdatatransmissionorwhereitisdesirablef

3、orduetotheinfig1.avarietyofhigherlayerprotocolstoruninparalleltotheapplicationsystemprotocol.ThelattersituationisgrowingSTANDARDETHERNETcharacteristicforEthernet.MostusersofTCP/IPbasedrealisationSinceitsintroductionin2000,EtherNet/IPhasshownaEthernetwanttocontinueusingitasbefore,wit

4、houtthethatitcanremarkablegrowthinmanyapplicationsthatutilisedneedtoresorttoahighlysegregatednetworksegmenttotraditionalfieldbuses.InstallednodesforEtherNet/IPrunthereal-timeprotocol.TheCIPSynccommunicationperformalonenowexceedonemillion.Thissuccessislargelyprinciplemeetstheserequir

5、ements.real-timeattributedtothisTCP/UDP/IPbasedEthernetsystemCIPSyncallowssynchronisationofapplicationsincontrolintroducingreal-timebehaviourintotheEthernetdomaindistributedsystemsthroughprecisionreal-timeclocksinwithoutgivingupanyofitshighlyappreciatedfeaturesalldevices.Thesereal-t

6、imeclocksarekeptintightsuchascompany-wideaccesswithstandardandspecialisedsynchronisationbybackgroundmessagesbetweenclockByDrRichardPiggintoolsthroughcorporatenetworks.ThespecificstrengthofmastersandclockslavesusingtherecentlypublishedEtherNet/IPisthatitdoesnotrequireamodifiedorhighl

7、ystandard:‘IEEE1588–StandardforaPrecisionClocksegregatednetwork;standardswitchesandroutersusedinSynchronisationProtocolforNetworkedMeasurementandtheofficeworldcanbeusedwithoutmodification.AttheControlSystems’.Thislaysthefoundationforaprecisesametime,allexistingtransportlevelorTCP/UD

8、P/IPlevelsynchronis