Bronkhorst FLOW-BUS interface Manuale Utente Scaricare il pdf (Pagina 4)

BRONKHORST®

1 GENERALPRODUCTINFORMATION

1.1 INTRODUCTION



FLOW‐BUSisa fieldbus,designed byBronkhorst

,basedonRS485technology,for

digitalcommunicationbetweendigitaldevices,offeringthepossibilityofhost‐control

byPC.ItcanbeusedwithasocalledMultibusinstrument.



Characteristics:

 Baudratesof187500(default)or400000Baud

 +15...24Vdcsupplyvoltage

 EasyinstallationandcommunicationwithotherBronkhorstequipme

nt

 Automaticnodesearch

 Automaticbusoptimization.(gapfixing)

 PC‐communicationthroughRS232vialocal‐hostfunctionorstand‐alone

interface

 Connectionofmax.120instrumentsto1bus

 Maximumbuslength:600metres

ExampleofaBronkhorst

instrumentwithFLOW‐BUS

interface

Bronkhorst: ThisincludesBronkhorstHigh‐TechB.V.,BronkhorstCori‐TechB.V.and

M+WInstrumentsGmbH.



1.2 MULTIBUSTYPES



In2000Bronkhorstdevelopedtheirfirstdigitalinstrumentsaccordingtothe

“multibus”principle.Thebasicpc‐boardontheinstrumentcontainedallof

the general functions needed for measurement and control, including

alarm,totalizinganddiagnosticfunctions.IthadanalogI/O‐signalsandalso

anRS232connectionasastandardfeature.In a

dditiontothisthere isthe

possibilityofintegratinganinterfaceboardwithDeviceNet™,Profibus‐DP

,

Modbus,FLOW‐BUSorEtherCATprotocol.

Thefirstgeneration(MBC‐I)wasbasedona16bitFujitsucontroller.Itwas

supersededin2003bytheMultibustype2(MBC‐II).Thisversionwasalso 

based on the 16 bit Fujitsu controller but it had several improvements to

theMBC‐I.On

eofthemisthecurrentsteeringofthevalve.Itreducedheat

productionandimprovedcontrolcharacteristics.ThelatestversionMultibuscontrollertype3(MBC3)isintroducedin

2011.It isbuildarounda72MHz 32bitNXP ARMcontroller.IthasADand DAco

ntrollerson  boardwhichmakesit

possible to measure noise free and control valves without delays. The internal control loop runs 6 times faster

comparedtotheMBC‐IIthereforecontrolstabilityhasimprovedsignificantly.Italsohasseveralimprovedfunctions

likereversevoltageprotection,inrushcurrentlim

itationan

dovervoltageprote

ction.



MBC3instrum

entscanberecognisedbythe“MBC3”placedonlowerleftside

oftheinstrumentlabel(seeexample).



Page4

FLOW‐BUSinterface9.17.024

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