The Referential Solution on the Connection Scheme between PLC System and Sensor说明书用户手册.pdf

SUNYUANSZISOSeriesAnalogsignalIsolationTransmitter

TheReferentialSolutionontheConnectionSchemebetweenPLCSystemandSensor

Generalization:

Inindustrialfield,thetechnicaldesignusedinanalogsensorsforpressure,displacement,temperature,flowrate,rotationalspeedetcis

different.Inthesensor,two-wireandfour-wirearethecommonmodesinitspowerdistribution,andtherearedifferencesinanalogsignal

output,themostcommonoutputsignalsare0-20mA/4-20mAcurrentsignaland0-75mV,0-5V,1-5Vvoltagesignal.Andinorderto

successfullygatherallkindsofanalogsignalofsensorsintoPLC/DC/FCS/MCU/FA/PCsystem,amatchingselectionneedstobedoneonthe

basisofthefunctionsandtechnicalfeaturesofsensorsanddataacquisitionsystem,andthepowersupplydifferencesofsensorsanddata

acquisitionsystemaswellastheEMCinterferenceinindustrialfieldalsoneedtobeconsidered.Usuallytheanalogsignalistransmittedto

PLCandotherdataacquisitionsystemafterbeingisolated,amplifiedandconverted.PLCgatherstheanalogordigitalsignalsfromsensor

throughsignalwire,thenprocessthesignals,iftheoutputofsensorisanalogtype,thePLCshouldbeconnectedtoanaloginputport,

otherwiseitshouldbeconnectedtodigitalinputport.

Switchvaluesensorisazerocontactswitch,itcanbeusedastheswitchvaluetoinputsignal,usuallyastheswitchvaluecontrolling

equipmentslikeinmachine,machinetools,etc.Analogsensortransformsdifferentphysicalquantities(e.g.:pressure,flowrate,temperature)

intoanalogquantities(4-20mAcurrent/1-5Vvoltage).Analogsensorastheanaloginputmoduleusuallyusedinprocesscontroltoinput

signal.DigitalsensorreferstothesensorwhichoutputsdigitalsignalorcodebyadjustingormodifyingtheA/Dconversionmodulein

traditionalanalogsensors,suchasamplifier,A/D