理解S7-200网络通讯的基本概念-【文献翻译，毕业设计专用】

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1、外文文献翻译2014年6月第1页共18页UnderstandingtheBasicsofS7-200NetworkCommunicationsSelectingtheCommunicationInterfaceforYourNetworkTheS7-200isdesignedtosolveyourcommunicationsandnetworkingneedsbysupportingnotonlythesimplestofnetworksbutalsosupportingmorecomplexnetworks.TheS7-2

2、00alsoprovidestoolsthatallowyoutocommunicatewithotherdevices,suchasprintersandweighscaleswhichusetheirowncommunicationsprotocols.TheS7-200supportsmanydifferenttypesofcommunicationnetworks.TheselectionofanetworkisperformedwithintheSetPG/PCInterfacepropertydialog.Ase

3、lectednetworkisreferredtoasanInterface.Thedifferenttypesofinterfacesavailabletoaccessthesecommunicationnetworksare:1.PPIMulti-Mastercables2.CPcommunicationcards3.EthernetcommunicationcardsToselectthecommunicationinterfaceforSTEP7--Micro/WIN,youperformthefollowingst

4、eps.SeeFigure7-1.1.Double-clicktheiconintheCommunicationsSetupwindow.2.Selecttheinterfaceparameterfo12Figure7-1STEP7--Micro/WINCommunicationsInterface第16页共18页PPIMulti-MasterCablesTheS7-200supportscommunicationthroughtwodifferenttypesofPPIMulti-Mastercables.Thesecab

5、letypespermitcommunicationthrougheitheranRS-232oraUSBinterface.AsshowninFigure7-2,selectingthePPIMulti-Mastercabletypeissimple.Youperformthefollowingsteps:1.ClickthePropertiesbuttonontheSetPG/PCInterfacepropertypage.2.ClicktheLocalConnectiontabonthePropertiespage.3

6、.SelecttheUSBorthedesiredCOMport123Figure7-2PPIMulti-MasterCableSelectionTipPleasenotethatonlyoneUSBcablecanbeusedatatime.TipExamplesinthismanualusetheRS-232/PPIMulti-Mastercable.TheRS-232/PPIMulti-MastercablereplacesthepreviousPC/PPIcable.AUSB/PPIMulti-Mastercable

7、isalsoavailable.RefertoAppendixEforordernumbers.UsingMasterandSlaveDevicesonaPROFIBUSNetworkTheS7-200supportsamaster-slavenetworkandcanfunctionaseitheramasteroraslaveinaPROFIBUSnetwork,whileSTEP7--Micro/WINisalwaysamaster.第16页共18页MastersAdevicethatisamasteronanetwo

8、rkcaninitiatearequesttoanotherdeviceonthenetwork.Amastercanalsorespondtorequestsfromothermastersonthenetwork.TypicalmasterdevicesincludeSTEP7--Mi