Bronkhorst FLOW-BUS interface Manual do Utilizador descarregar pdf (Página 19)

BRONKHORST®

4 FLOW‐BUSINSTALLATIONANDADDRESSING



4.1 INSTALLATION

AllmodulesinaFLOW‐BUSsystemmusthavetheirownaddress.FLOW‐BUSsystemswillnotfunctionproperlywhen

thereare more modulesonthesameaddress.Toavoidthis, modules willdoacheckbeforegettingoperationalon

theirbus‐addressandgiveamessagewhenthisaddressisoccupied.Ifyoure

ceiveacompleteFLOW‐BUSsystemfrom

Bronkhorstallmoduleshavebeen installedtothebusalready(inonesystem).Eachtimeyoupower‐upyoursystem

afterwards,themoduleswillstart‐uponthesameaddressonthebus,becausethesesettingsarestoredintheirnon‐

volatile memo

ry. So if you receive a new system, normally you only have to connectthe cables and switch on the

power.

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Page19

FLOW‐BUSinterface9.17.024



Seedocument9.17.023foramoreinformation.

Thisdocumentcanbefoundat:

http://www.bronkhorst.com/en/downloads

/instruction_manuals/



If a new module has to be connected to a bus system, it needs a free address. Normally this will be the first free

address counted from address 3. Address 0 is reserved for the start‐up procedure. Address 1 is reserved for an

interfacemoduleto(personal)computersandaddress2hasbee

nreservedforoperationmoduleslikeE‐7000.There

arefourwaystoaddanewmoduletoyourbussystem:



4.1.1 Installtobusviarotaryswitchesonthesideoftheinstrumen t(if present).

Onthesideoftheinstrumentarerotaryswitchesplacedandalabelwiththe

explanationoftheswitches.Makesuretouseascrewdriverwhichissuited

fortheswitches.



Theswitcheshavethefollowingfunction:



NODEADDRESS(00–99)



WiththeNODEADDRESSswitch,theinstrumentsaddresscanbeset.TheMS

Disthehighpartofthedecimalnumber

andtheLSDthelowpart.Forinstanceaddress25meansMSDon2andLSDon5.



Thedefaultswitchpositionis00.Inthispositiontheaddressissoftwareprogrammable.

Thedefaultsoftwareprogrammableaddressis3.



Durin

ginstrumentinitialisation,thenodeaddressswitchesareread.IftheswitchesspecifyavalidFLOW‐BUSaddress,

i.e.avaluefro

m3to99,thisvalueisused.

Ifthespecifiedaddressdiffersfromthevaluestoredintheinstrument,thenewaddressissavedinmemory.

IftheswitchesspecifyaninvalidFLOW‐BUSaddress,i.e.avalueof1or2,thevaluestoredintheinstr

ument’smemory

willbeusedastheaddress.



4.1.2 AutomaticinstallationtoFLOW‐BUS

MostFLOW‐BUS moduleshave thefacilityto install themselvesautomatically onthe bus.This meansthattheyare

abletofindthefirstfreenode‐addresscountedfrom3andconnectthemselvestothebus.Thisactioncanbestarted

bymeans of a manual interface on themodule. Directlyafterwards the newmodule will be part of the FLOW‐BU

S

system.



Makesuretoinstallonlyonenewmoduleatthesametime.

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