EN_EAM58P_0305

MultiturnABSOLUTEENCODERSEAMPROFIBUSMULTITURNABSOLUTEENCODEREAMPROFIBUSInstallingtheEltraProfibusencoderinanetworkrequirestheexecutionofthestandardstepsnecessaryforconfiguringanyProfibusDPslave.Thesequenceofstepsisasfollows:1Commissioningtheslaveonthemaster(seecorrespondingparagraph).2WiringtheencoderintotheProfibusnetworkusingornotterminationsdependingonthephysicalpositionthedeviceshasinthebus3Directlysettheaddress(whichmustbeuniqueinthenetworkandthesameastheonechoseninpoint1)fortheslave.4Preparingthemastersideapplication/sandsettinguptheProfibusnetwork.Onthebackcoveroftheencoder(seepicture)thereisaledinspectionwindow.Thedeviceoperatingstatuscanbecontrolledbythetwoledthroughthewindow.Thegreenoneshowsthepowerpresenceandmustbepermanentlyswitchedon.TheredledswitchesoffonlyduringtheperiodicdataexchangebetweentheProfibusmasterandtheencoder.Inthesectionplanalongsidethe2dip-switchesofterminationlineandthe8dipswitchesofdeviceaddressareshown.Intheparticularshownconfiguration,the2terminationlinecontactsaresettoOFFsotheterminationofthebusinnotexpectedtooccurontheencoder.Onlysevenoutoftheeightavailabledip-switchesareusedtoaddresstheslavebecausethemaximumnumberofdevicesthatcanbeconnectedtoaProfibusnetworkis126.Foraddressingthedevice,onlythefirstsevendipswitchesoutoftheeightavailableareused.Thecontactnumber8istheLSBwhilethenumber2istheMSB.Theeighthcontact(1)isusedtoinvertthecode.HardwareinstallationdeviceTheEltramultiturnProfibusencoderseries(IdentificationNumber0x0599)iscomplyingtotheProfibusDPstandardasdescribedontheEuropeanStandardEN50170Volume2.Particularly,EltraProfibusencodersareaccordingto“PROFIBUSProfileforEncoders,OrderNo.3.062”.TheProfibusDPinterfacemaintainsthesamemaximumresolutionandcharacteristics(8.192pprand4.096revolutions)ofthestand-aloneversionandaddstheplusoftheProfibusDPnetwork.BytheProfibusDPnetworkispossible:Duringtheperiodicdataexchange,gettingtheindicationoftheangu-larpositionfromtheencoder.Duringthesetup,settingtheresolutionasnumberfpositionswithinthesingleturnand.asnumberofturns.Duringthesetup,changingthedefaultincreasedirectioncount.ToperformthePRESEToperation(Settheencodertoreadaspecificposition).Readingthediagnosticoperatingmode.Gettinginfoaboutthecodesuppliedbythedevice.Directlyfromthedeviceitispossible:TodisplaytheON/OFFstatus.Todisplaythedeviceactivityonthebus.SettingthedeviceaddressIfrequested,insertinginthebustheterminationresistance.Invertingthecountingdirection.Presentation36www.eltra.ite-mail:[e-mail],32bis-Sarego(VI)-ITALY-Tel.[phone]R.A.-Fax[phone]©Copyright2005EltraS.p.a.-A-Allrightreserved.Allinformationinthiscatalogissubjecttochangewithoutnotice-ELTRAtakesnoresponsabilityfortypographicalerrors.Forthetermsofsalespleasecheckthewebsite:www.eltra.itMultiturnABSOLUTEENCODERSEAMPROFIBUS37ForconnectingProfibusencoderstothenetwork,cableswithinthedevicecanbeaccessedbythethreeskintops(inanyeventonlytwoofthemcanbeused).Usually,askintopisusedfortheconnectiontothebus,asecondonetocontinuethenetworkandthelastonetoeventuallysupplythepowertotheencoder(ifthepowersupplyisnotavailablebythenetworkinadditiontotheRS-485twinwire).ConnectiontothenetworkToaccesstheterminalblock,unscrewthetwoscrewsontherearplugandreleasetherearcasefromthemainonebyslidingitoutfromthesunkenconnector.Then,connectwiresaccordingtothediagramontheconnectorandasreportedonthetableontheright.PleaseNOTE:TosetandconfiguretheslaveintotheProfibusDPmaster(‘commis-sioning’step)itisnecessarytousethe“Exx_0599.gsd”filedeliveredwiththeencoder.Thisfilecaneventuallybedownloadedfromourfollowingwebsite:www.eltra.it.Terminalblockaccess+V0VABABSUPPLYVOLTAGEGROUNDPROFIBUSDPLINEOUT(Green)PROFIBUSDPLINEOUT(Red)PROFIBUSDPLINEIN(Green)PROFIBUSDPLINEIN(Red)CableconnectionsMultiturnABSOLUTEENCODERSUsually,anAtypecableisusedtowireaDP/FMSnetwork.Thiscablehastohavethefollowingcharacteristics:Thiscableallowsanoptimumnetworkutilization.Infact,itispossibletoreachthemaximumcommunicationspeedallowed(12MBaud).Howe-ver,therearesomelimitationsduetothemaximumphysicaldimensionsofabussegmentasfollows:Finally,mainphysicalandtopographicalspecificationsofaProfibusnetworkareasfollows:EAMPROFIBUS38LEDBelowitisreportedanexampleofthestandardpositionofad-dressandterminationdipswitchesaswellassettingsforclosingaProfibusline.DIP-SWITCHESsettingNetworkspecificationsCharacteristicsinŸOperatingcapacity(pF/m)Loopresistance(Ÿ/km)Corediameter(mm)Corecross-section(mm2)135...165atafrequencyof(3...20Mhz)30=1100.64*)0.34*)ParameterCabletypeA9.619.293.75187.55001500120001200m1200m1200m1000m400m200m100mBaudrate(kbit/s)Range/SegmentMaximumnumberofstationpartecipatingintheexcahngeofuserdataMaximumnumberofstationspersegmentincludingrepeatersAvailabledatatransferratesinkbit/sMax.numberofsegmentsinseriesDP:126(addressfrom0...125)FMS:127(addressfrom0...126)329.6,19.2,45.45,93.75,187.5,500,1500,3000,6000,12000AccordingtoEN50170,amaximumof4repeatersareallowedbetweenanytwostations.Dependentontherepeatertypeandmanufacturer,morethan4repeatersareallowedinsomecases.Refertothemanufacturer’