Bronkhorst FLOW-SMS Series Manual do Utilizador descarregar pdf (Página 18)

BRONKHORST HIGH-TECH B.V.

9.17.057 page 18

3 Basic operation

3.1 General

AFLOW‐SMSinstrumentisequippedwithadigitalelectronic‘Multibus’pc‐board.Theseelectronicsconsistofa

micro‐controllerwithperipheralcircuitryformeasuring,controllingandcommunication.Theflow/pressuresignal,is

measuredanddigitizeddirectlyatthesensorandprocessedbymeansoftheinternalsoftware(firmware).



Processedvaluescanbemeasuredand/oroperatedbymeansof: 

 Analoginterface(0...5Vdc/0...10Vdc/0...20mA/4...20mA)

 DigitalRS232FLOW‐BUSinterface(connectedtoCOM‐portbymeansofspecialcableon38400

Baud)

 DigitalRS485Modbusinterface

 DigitalProfibusinterface

 DigitalDeviceNetinterface

 DigitalEtherCATinterface



Operationviaanalogordigitalinterfacecanbeperformedatthesametime.Aspecialparametercalled“control

mode”indicatestowhichsetpointthecontrollershouldrespond.

3.2 Analog operation

Atanalogoperationfollowingsignalsareavailable:

 measuredvalue(analogoutput)

 setpoint(analoginput)

 valvevoltage(controllersonly)



Thetypeofinstalledanaloginterface(0‐5V,0‐10V,0‐20mAor4‐20mA)canbefoundinthemodelkeyofthe

instrument.Refertoparagraph2.14.



Setpointsbelow2%ofthefullscalewillbeinterpretedas0%setpoint.

Whenoperatingtheinstrumentthroughtheanaloginterfaceitispossibletoconnecttheinstrument

simultaneouslytoRS232forreading/changingparameters(e.g.controllerresponseorotherfluid

selection).

3.3 Manual interface: micro-switch and LED’s

Bymeansofmanualoperationofthemicropush‐buttonswitchsomeimportantactionsfortheinstrumentcanbe

selected/started.Theseoptionsareavailableinbothanalogand digital/fieldbusoperationmode.



Thesefunctionsare:

‐reset(instrumentfirmware‐programreset)

‐restorefactorysettings(incaseofunaccidentlychangingofthesettings)



TheLED’sontopoftheinstrumentcanalsobeusedformanualoperationofsomeoptions.ThegreenLEDwill

indicateinwhatmodetheinstrumentisactive.TheredLEDwillindicateerror/warningsituations.

Fordetailssee“manualinterface”inOperationInstructionsDigitalInstruments(documentnr.

9.17.023,Chapter10)

3.4 Basic RS232 FLOW-BUS operation

Digitaloperationaddsalotofextrafeatures(comparedtoanalogoperation)totheinstruments.

Suchas:

‐setpointslope(rampfunctiononsetpointforsmoothcontrol)

‐8selectablefluids(calibrationsettingsforhighaccuracy)

‐directreadingatreadout/controlmoduleorhostcomputer

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