Bronkhorst DeviceNet slave interface Manual do Utilizador descarregar pdf (Página 11)

BRONKHORST®

Page11DeviceNetinterface   9.17.026

3 FUNCTIONALDESCRIPTION

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3.1 GENERAL



The Bronkhorst digital instruments will behave as slaves on the DeviceNet bus. This means all communication

(instructions/readout)willbeperformedbyamasteronthesameDeviceNetfieldbus.MostlythiswillbeanyPLCor

PC‐cardcontrollingaprocess.



TheBronkhorst DeviceNetMFCisaGroup

2OnlyServerdevicewhichmessagescomplywiththeCAN2.0Astandard

and with the DeviceNet protocol. The DeviceNet MFC supports two typesof connection: Explicit and Polled I/O. As

definedbytheDeviceNetprotocol.



3.2 OBJECTSANDSERVICES



Bronkhorst MFC’sconsist of several objects with attributes and services for interfacing to DeviceNet.These objects

aredescribedbelow.



TheDeviceNetMassFlowControllerwillbein"Idle"stateafterpoweredonorreset.Inthisstate,thedevicewillnot

allow the Master to use the SetpointAttributeto

control gasflow. Instead, gas flow willbe controlled bythe value

previouslysetintheAnalogActuatorObject’sSafe‐StateAttributeandSafe‐ValueAttribute.Forinstance,iftheSafe‐

StateAttribute had avalue0x03whichis the codefor“UseSafeValue”thenthedevicewill set the

actuator (valve)

according tothe value previously stored in theAnalog ActuatorObject’s Safe‐Value Attribute. To be able to control

the flow, the Master device must send a “Start” request to the supervisor object of the Mass Flow Controller. The

“Start”requestbringsthedevicefrom“Idle”stateto

“Executing”state.Inthisstate,thedevicewillbeexecutingnew

setpoints received from the Master and then control the flow accordingly. Another way to bring the device in the

"Executing"stateisbysendingI/Odata(PolledI/O).



3.3 EXPLICITMESSAGING



Usingexplicitmessaging,followingtablesareneededwiththedescriptionsofDeviceNetobjectsforDigitalMassFlow

/PressureControllers/Meters.Thesemessageshaveana‐cycliccharacter.Forcyclicmessages,seePolledI/Ointhe

nextparagraph.



TheFLOW‐BUScolumnshowshowDeviceNetattributesaremappedontheinternalFLOW‐BUS

variablesoftheinstrument.ThisinformationcanbeusefulforwhoisfamiliarwithFLOW‐BUS.



3.3.1 IdentityObject

ClassCode:01HEX

Thisobjectprovidesidentificationofandgeneralinformationaboutthedevice.TheIdentityObjectispresentinallCIP

products.



IDENTITYOBJECT’SINSTANCEATTRIBUTES(Instance=1)

IDENTITY

OBJECT

ATTRI‐

BUTE

ATTRIBUTENAME

SERVICE

CODE

DATATYPE

FLOW‐

BUS

Comment

0x01 0x01 VendorId 0x0E UINT706

0x01 0x02 DeviceType 0x0E UINT0x001A

0x01 0x03 ProductCode 0x0E UINT 113,12 IdentNr

0x01 0x04 Revision 0x0E STRUCTVmajor.minor

0x01 0x05 Status 0x0E WORD always0x0001

0x01 0x06 SerialNumber 0x0E UDINTcalculatefrom113,3

0x01 0x07 ProductName 0x0E SHORT‐STRING “Bronkhorstmeter/controller”

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