PRS PROFIBUSDPMasterRedundancy PRS TheoptimalsolutionforasafePROFIBUSDPMasterredundancyconceptPRSprovidesswitchoverofthePROFIBUSlinebetweentwoidenticalDPMasters.ThisavoidsanygalvaniccontactbetweentheDPMasters,theycanthereforebeconfiguredwithidenticalPROFIBUSaddresses,makingMultiMastermodeunnecessaryandexcludesdoubleaddressconflict. PRSisacompact24VolthatrailmodulecontainingtheswitchinglogicaswellasanintelligentdoubleDPSlave.ThedeviceallowstheconnectionoftwoDPMastersandthePROFIBUSconnectiontotheDPSlaves.TheSwitchcontrolsthestatusoftheoperationalDPMastersystemonthePROFIBUSprotocolandapplicationlevel. IncaseoffailureoftheoperationalMasterPRSphysicallyswitchesovertothestand-byMaster,whichseamlesslytakesovertheDPSlaves. IncontrasttotheestablishedFlyingMasterprincipleadoubleaddressconflictcannotoccurwithPRS,evenifthefailedDPMasterisstillactiveonthePROFIBUSlevel.FurthermoremanyDPMasterimplementationsonthemarketdonotsupporttheFlyingMasterprinciple.AsbothDPMastersarepreventedfrombeingconnectedtothebusatthesametime,thedeviceavoidsalldisadvantagesofcurrentredundancyconcepts. PRSprovidestheDPMasterswithimportantinformationabouttheredundancyoperation,i.e.thealivestateofthecomplementarysystem,italsoallowstheexecutionofaswitch-overcommand.Thedevicecanbeusedinverycomplexredundancysystems,i.e.inconnectionwithPROFIBUSOPCserversoroverlyingEthernetbasedcellnetworks.FurthermorePRScanbecontrolledviabothintegratedEthernetconnectionsifdirectcontrolviathePROFIBUSisnotpossible. ThereisnosinglepointoffailurewiththePRSbecauseifthedevicedoesdevelopafaulttheMastertoSlavecommunicationwouldcontinuewithoutinterrupted. TechnicalData Interfaces Ethernet PROFIBUS Serial 2*10/100BaseT 3*RS485(DB9) RS232(screwterminal) BaudRates Ethernet PROFIBUSRS485 RS232 max.100Mbit/s max.12Mbit/s 19.2Kbit/s SupportedPROFIBUS ProtocolVersions DPV0 DPSlave