附錄二：英文文獻(xiàn)XM-120&121DYNAMICMEASUREMENTMODULESTheawardwinningAllen-BradleyXMSeriesistheworldsfirstmachinemonitoringandprotectionsystemdesignedasadistributednetworkofmodulesdeployedonanopenstandardindustrialbus.TheXM-120(Standard)andtheXM-121(LowFrequency)DynamicMeasurementModulesareintelligent2-channelgeneral-purposemonitorsthatsupportmeasurementsofdynamicinputssuchasvibration,pressureandstrain.Themodulesbuilt-intachometermakesthemparticularlywellsuitedformonitoringshaft,casingandpedestalvibrationinrotatingequipment.ThetwomodulesareidenticalexceptfortheirhighpassfilterselectionsandinthattheXM-120alsosupportsshafteccentricitymonitoringwhenitsalternateXM-120Efirmwareisloaded.Inputsacceptedincludeeddycurrentprobe,standardintegratedElectronicsPiezoElectric(IEPE)accelerometer,oranyvoltageoutputmeasurementdevicesuchasavelocityorpressuretransducer.Inadditiontovibrationinputs,themodulesacceptonetachometerinputtoprovidespeedmeasurementandorderanalysisfunctions.Bothmodulesemploya24-bitA/Dconverterwhichprovidesunparalleledresolution,makingthemideallysuitedfordetectingmachineryproblems.VirtuallyanyfaultthatmanifestsitselfthroughchangesinthemagnitudeorphaseofvibrationcanbedetectedbytheadvancedsignalprocessingcapabilitiesoftheXM-120&XM-121DynamicMeasurementmodules.Theseincludemostmechanicalandelectricallyinducedfaultssuchasunbalance,bearingwear,rotorcracksandrubs,instabilitiessuchasoilwhirl,preloadconditions/misalignmentandantifrictionbearingdefects.Withtwo4-20mAoutputsandasingleonboardrelay,expandabletofive,andanintegraltachometer,theXM-120andXM-121modulesofferacompletemonitoringsysteminasmall,simple,easilyinstalled,easilymaintainedpackage.TheXM-120andXM-121modulescanoperatestandalone,withnointerfacetohigher-levelcontrolsystemsorinteractiveuserinterfaces.TheycanalsobedeployedonastandardordedicatedDeviceNetnetworkwheretheycanprovidereal-timedataandstatusinformationtootherXMmodules,PLCs,DCSandConditionMonitoringSystems.ConfigurationcanbeperformedeitherlocallyorremotelyviatheDeviceNetnetwork.Localconfigurationisprovidedbyasimple,intuitiveSerialConfigurationUtilityexecutingonaPCconnectedtothemodulesserialcommunicationsport.RemoteconfigurationcanbeperformedfromanynetworkedPCexecutingeitheranystandardDeviceNetconfigurationsoftware,ortheXMspecificconfigurationtoolincludedinRSIsRSMACCEOLsoftwaresystem.Selectingwhichmodule,theXM-120orXM-121,isappropriateforanapplicationisdependentonconsiderationoftheminimumfrequencyofinterest,thetypesofsensorsappliedandanyintegrationrequirements.Typicallytheminimumfrequencyofinterestwillbeaboutonethirdthenormaloperatingspeedofthemachine,unlessitisimportanttomonitorthemachinesbehaviorduringstartuporcoastdown.Whenmeasuringlowfrequencyvibrationitisessentialthatthesensorusedberatedbelowtheminimumfrequencyofinterest.Otherwisethesensormayintroducesignificantnoisepossiblyresultinginerroneous,ormisleading,data.Andifthesignalmustbeintegratedthenspecialattentiontothesensorqualityandhighpassfilterselectionmustbemadetoinsuretheminimumofnoiseintroducedtothesystemasonlyasmallamountofnoise,atlowfrequencies,canresultinadramaticreductioninthequalityandcapabilityofintegratedmeasurements.CommunicationsDeviceNet:StandardDeviceNetprotocolforallfunctionsAvailableElectronicDataSheet(EDS)fileprovidessupportbymostDeviceNetcompliantsystemsAutobaudto125kb,250kbor500kbConfigurableI/OPollResponsesize(bytes)andAssembly(6tochoosefrom)helpsoptimizespaceutilizationwithinusersscannerinputtablesNote:TheXM-120/121usesonlytheDeviceNetprotocol,notpower.Modulepowerisprovidedindependently.SideConnector:AllXMmeasurementandrelaymodulesincludesideconnectorsthatallowinterconnectingadjacentmodulestherebysimplifyingtheexternalwiringrequirements.TheInterconnectprovidesprimarypower,DeviceNetcommunicationandthecircuitsnecessarytosupportexpansionmodulessuchastheXM-441ExpansionRelaymodule.Serial:LocalconfigurationviaSerialUtilityProgramRS-232viamini-connectororterminalblockBaudrateautobaudto19200Tachometer1TachometerInputs:25V(50Vmaxpeaktopeak)InputImpedance:120kohmsminimumSpeed/FrequencyRange:1to1,200,000RPM0.0167to20,000HzSpeedMeasurementError:1to12,000RPM+/-1RPM12,001to120,000RPM+/-6RPM120,001to1,200,000RPM+/-50RPMPulsesperRevolution:0(tachoff)to50,000Inputs2Channelsof:EddycurrenttransducersignalsAccelerometersignalsVoltagesignalsfromanydynamicmeasurementdevice,suchasavelocityorpressuretransducerTransducerPower:Constantvoltage(-24Vdc)*Constantcurrent(4.5mA20%from+24Vdc)*None(voltageinput)*Tachometermaybepowered,constantvoltage,orconfiguredasvoltageinputVoltageRange:Selectableinsoftwareas0to20V(min)40Vmax.peak-to-peakSensitivity:UserconfigurableInputImpedance:100kOutputs4-20mAOutputs:Eachoutputisindependentlyprogrammedtorepresentspeedoracceleration,fromeitherchannel2isolatedoutputs300ohmmaxloadBufferedOutputs:1activebufferperinputchannelResistivebufferfortachometerIndicators7LEDs:ModuleStatus-red/greenNetworkStatus-red/greenChannel1Status-off/yellow/redChannel2Status-off/yellow/redTachometerStatus-off/yellow/redSetpointMultiplier-off/yellowRelay-off/redSignalConditioningSamplingModes:AsynchronousSynchronousFrequencyrange:1Hzto20kHzResolution:A/DConversion:24bitsDynamicRange:80dBfs(0.01%fs),-90dBfs(typical)FFTLines/Waveformblocksize100/256200/512400/1024800/2048Amplituderange:DependentonsensitivityIntegration:Twolevelsprovided,firstinhardware,secondinfirmwareAveraging:Anynumberofaveragesmaybespecified.Ifsamplingmodeis:Asynchronous:Averagingwillbedoneonthespectra.Synchronous:AveragingwillbeperformedonthetimewaveformsLowPassFilters:IndependentlyconfiguredperchannelSpectraFMAX:10Hz-20kHzOptionalOverallmeasurementLPfilter:200Hz-20kHzRollOff:-24dBperoctaveHighPassFilters:IndependentlyconfiguredperchannelXM-120:IntegrationOFF:1,5,10,40,1000HzRollOff:-30dBperoctaveforthe1HzHPF,otherwise-24dBperoctaveIntegrationON:5,10,40,1000HzRollOff:SingleIntegration:-30dBperoctaveforthe5HzHPF,otherwise-24dBperoctaveDoubleIntegration:-42dBperoctaveforthe5HzHPF,otherwise-24dBperoctaveXM-121:IntegrationOFF:0.2,0.8,2,4,23.8HzRollOff:30dBperoctaveforthe0.2HzHPF,otherwise24dBperoctaveIntegrationON:0.8,2,4,23.8HzRollOff:SingleIntegration:-30dBperoctaveforthe0.8HzHPF,otherwise-24dBperoctaveDoubleIntegration:-42dBperoctaveforthe0.8HzHPF,otherwise-24dBperoctaveUnits:gvoltmilsummm/sPaipspsiComplexDataSpectra(synchronousorasynchronous)TimeWaveform(synchronousorasynchronous)SimultaneousTimeWaveforms(