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inegaes Foresght oo an Malab envionment; xe

[18] which integrates Malab 1] an ATiSA T

Stuio [20] Too integraion has also been invesgate in

he automotve secto negatng ADAMS an Xmah

ools 21]. In a cases, ony a concete set of tools is

inegae

This paper presens a hearchca esgn mehooogy

for strbute nustral conol systems an a vaiaion

mehoology by means of a cosmuation famewok

Section II gives a general oveiew of the FLXICO

proec Secion escrbes he herachcal esgn of he

strbute cono system n secion the cosmulaion

amewok is pesente. Finaly, in secton V, the

herachcal esign an the cosimulaion amewok ae

iustate though a case stuy: an inustral hea treatment

lne

II. EXCON ROEC

The general goa of he FLXCO poject, nance by

he uopean Unon's nformaion an Science

Technoogies progamme, is to evelop methoologies that

enable Comerca OffheShelf (COS) ools

inegaon fo the esign an epoyment of Disibue

Contol Sysems (DCS) wh high egree of exbiy,

epenabity an reusablity

his proec speccaly aesses he eveopmen of

he capability to pouce open hgh performance

epenabe, istrbue fau tolerant sysems in euce

mescales an a lower cos

Wthin he toolse, the ffeent phases of the esgn

cycle are aesse using he appopriae tools In this

sense, the proope ha is being evelope integates

ATSA S UML tool, Malab envionment anSaGRAF nhance oo ATiSA tS UML ool is use

o moe he overa heeogeneous strbue conro

sysem. Matab envronmen s use to moe he pocess

ynamics (uing smulaton phase) ahough it can also be

use o moe some pas of he contro system Fnay, the

scree pas of he oveal control system are

impemene n ISaGAF hance oo, a PLC

progamming envroment ha s IC 1131 stanar

compant

ICICAL SGN F SIBTDONRO YSTM

he hierachical esgn of he inusta stbutecontro system has been evelope following heguielines an recommenatons of the C 1131 stanfor evelopng PLC base appcaions This hiearchicaesgn alows he reuse of nctona componensbelonging o any leve of he hiechy

he conro system specicaon consists of a hearchyof levels

Level The pant

Level Inepenent subsysems of he pant.

Leve 2 o -1 Sets of nctonal components

4721

Level emenay nctonal componentshus the moel s escibe by means of a set of

Functonal Componens (FCs) having each FC a set ofnpus an ouputs an conguration parameters hesenpus an oupus as well as he FC funconaliy, mus becely ene an ocumente to allow an easy

component euseThe control system ncues the actions one ring he

nomal opeaion as well as faul eecton anaccommoaon ormally, when a non crtica faul iseecte an ala is sent o the opeato Ciica aarmsusualy sa acons on the pocess. In this sense inpus oan ouputs om FCs can be groupe epenng on therfunconaiy as secuies (aa sgnas) intelockngs(contions o be me fo the execuon of a bock)operaor commans an ata, pocess aa (e signas)

an exteal aa (infoaton processe by other bocks)On he other han, ouus can be goupe as signaling

an process aa he fferent ypes of nputsouputsto/om a FC ae shown in Fg 1.

Seuies .

Ikg

Operato comas

O d

Exteal data

Cofguratinparametes

F

Bi

Compent

Fig 1 Gnri ntionl bsi omponnt

Signalhng

Poces ata

Within he FLXCO pojec, eve FCs are

impemene using any of the anguages provie by theIC11313 sana an store in lbraies. he FCsbelonging o leve , progams are mplemente in IC1131-3 Stucte Tex (ST) The C1131 stanenfoces the use of reusable Funcon Blocks (FB), theseFBs are pograme once an use as many times asneee Usually, n his kin of herarchca esign, eve 0contains he applcation evel 1 conans pograms anlevels om 2 to ae compose by FBs. Finay, oweslevel, eve , contains FBs ha are mpore omlbaries

Within he FLXCO pojec, ATiSA tS UMLool 20] s he tool n whch he moel of he overastrbute control system is ene The moel consists of

he funconality, followng a herachcal speccation,an the applicaton mplementaton using paiculaechnoogies. he eniion of the harware an sowaearchtecures follows he IC 1131 sowe moe. Duinghe secon year of the poject the main targe s o achieveauomac coe geneaton n C131 3 Sucre Tex(ST) om he specicaion moelle in he UML oo

The auomac coe generato allows rap pootypngIn hs way, the oose can be use o pefo vaaionests. Geneate coe s valiate n he folowing way

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Level N: Unity tess of FBs, previously to besored in a ibray. hs s peformed wthn he

development oo.Levels N- to 0 Incementa inegrated ests omlevel N- up to evel To achieve these negatedests, a co-simulaon amewok has been designed

wihn he FLEXICON poject.Nex secon summazes the cosmuaion famewok A

deailed descpion of the cosmulation famewok can befound in [15]. In secton V the use of he amework isiustated though a case sdy

V OLAON O

The main tages of his amework are:Loosely couplement of tools ha paticpate in hecosmulaion

oo negation between execution tmes ouputdaa om a tool s pocessed by other toolsntegraion durng simuaion tme: toos exchange

daa durng simuatonThs amewok s geneicaly made up of N ools thatineract rough the cosmuaton envonmen.

Inteacons between tools ae mpemened usng CORBAmiddlewae Fo each too, a serve s deveoped heseservers offer data we and ead as well as command

dspatchng servces using he AP of each too On theother hand, hee is a cosmulation appcaion whchembeds the N CORA ciens This applicaton wi

manage he cosmulation executon and toolsyncronizaton by means of he simuaton and daainerchange each samping perod Fig.2 shows the N toolcosmulaion scenario ha contans in addion o he Nools and N severs, the co-simulaton appcaon

fol 1 &

COR8A S ! 2 0 N &

B evr

& R

Fig.2. Generic co-simulation scenarioEach CORBA server is the ink between the too and the

cosmulaon applicaton These seres transfom dectrequests om CORBA cens nto data transacons ordec commands usng the tool AP

In oder o add a new ool to he cosimulationfamewok he next steps must be followed

First step

Fst of all, a deailed study of he AP offeed by he tooto be added has to be pefomed. I includes the supportedprogammng anguages, as we as the daa types and

4722

comands his nformation aows the deniion of theCORBA interfaces.

he Obec Managemen Group (OMG) IntefaceDeniion Language (DL) [22] is he anguage used todescibe he nefaces ha cents equie and seresprovide An inteface dention wren n OMG DL

compeely denes the neface fo each opeaon AnOMG IDL inteface povides he information needed o

develop ciens ha use the neface opeaons IDL is alanguageneutral Inerface Denion Language. Eachlanguage (eg Java, ++ ) that suppors CORA has itsown DL mapping

B Second step

Once he interface (IDL e) has been dened, themehods dealed n he DL le must be developed n heCOA seres

CORA clents, one per seve, ae embedded ino hecosmulaion appcaion n CORA cents, there s noneed to develop any knd of extra code only he IDL

inerface must be compied. hrough these clents, he cosimulaion applcation wl be abe to send requess oservers execung he mehods dened in the IDL.

Third step

Fnaly i s necessay to dene the interacton sequencebeween toos during he cosimuaion operaion he cosimulaion s congured by means of a conguraton le

hat denes he inteacton beween tools By means of heedion of this conguraion le, the ogc of he cosimulaon can be changed

V. ASE YA EA REAMENL

In this secton the poposed hearchica design s apped

o an ndustral hea eatment line (HL). he cosimulaion famewok is used for achevng inegated

ests A typcal HTL, as shown in Fg 3, s composed byhe folowing sub-sysems: a load system, an ausenizingace a emperng tank, a washing ank and an annealingace.

7

Fig. 3. General overview o a heat eatment line

Fg 4 llusrates the austenizng face that is composed

by fou zones and two bers in each zone. empeateegulaion is perfomed fo each zone, usualy around 850C A conveyo bet moves he pieces trough he aceThe speed of this conveyo depends on he requiedheaing teamen

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The ansions etween opeaton staes are drven ynput pos ha may come om the contro sysem or omthe Local Operaor Staon nfomaton om the pocessenvroment s modeled as input pors Fed sgnals aremodeed as outpu pots. here e aso some other pos

that have een modeled fo sgnalling purposes ae IIIusates the ausenzing nace mode pors

The cono sysem has een deveoped using SaGRAFEnhanced tool (Fig.6). An ISaGRAF Ehanced proec isdened though he IEC 1131 standard elementsconguatons (e.g PLC), resouces (e.g CPs) asks,progams, con locks and funcons [3]

Fig.6. Conol systm for TL dvlod n SGRA Encd

The cono system of he austenzng ace developedn ISaGRAF Enhanced, contains a conguation and tworesouces Resource 1 executes he logc par of the conosysem whie Resouce execues he emperaure

reguaions.

o achieve he cosmuaion eween the process mode(in Mala) and he contol system (in ISaGRAF enhanced)two dffeent types of neracion etween them have to edstngushed

The logc pa of he contro system which is nchge of he ll l ine opeaion faut detection andaam geneaton. hus, exchange should e as fasas possle

4724

he imed ps. In this case t s constiuted y theemperaure egulaors hus data must eexchanged each controer samping perod

n tae he contro model nput and outpu vaiaesae also cassied as ogc or tmed vaaes

2) Coguration of the co-smulationData interchange etween contol sysem n SaGRAF

and he pocess mode n Matla/SmuikSaeow muste congued. his exchange of nfomaton includes oththe ogc pa of the conro sysem and the med patprocessed a each controlle sampng perod

Thus he Matla model inputs and ouus must eassociated to the SaGRAF mode input and outputvaiales (as shown n tae )

boolboolboolboolboolboolboolboolrl

boolboolboolrl

ABLE IISGRAF M pPGS

Vribl Nm

t ort Nm

srovlvOnd logic srovlvOnorg logic onrgurgDon logic urgDonctivtElctrovlv logic ctivtMinElclrmBNotStrd logic brNotStrd

brOn logic brOnfnCon logic znConctconZonFn logic cnConnctl AirSrovlv imd l AirSrovlv

ot Nm

Vril Nm

srovlvOnd out milcrCoSmnElcovlvCon outt combustioMotorConcnConnctd outt onSrvovlvTsl outt tmZl nutVl

Mehn

ism

inuinutinutinutinutinutinutinut

Pa

logiclogiclogic

timd

Fg7 epesents he use interface where the mapeween he pocess input and output pos and he conovaiales is pefomed n the example there are fou nnecycles that coespond to he logic part. hs vaue meanshat logical daa inerchange wil occu fou imes fasehan conol nformation nerchanged a he samplingequency

Fig. 7. Cosimltion congrtion intrfc

The complete scenario wih oth tools and the cosimulaon applcation can e shown in Fg 8

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Co-simulation Applicain

Fig 8: Co-simulation scenario

uring cosimulaon, he conro oops ae cosethough CORBA as sate in he cosmulaionconguraion e Bu, i is also possbe o sen iect ortme ien commans o boh ools (eg. to smuae a fautn a sensor signa o to sen an opeato oe o the conolsystem).

ONCLUSION

In this pape a mehooogy for esigning an aiainginusial istrbute cono sysems has been proposeThe esgn, base on EC 1131 stanar an heachcallyene, aims component euse he cosimuatonamewok, eelope whn the LEXICON projecallows incemental aiaions of he esign he seps toachiee both the esgn an he aaion hae beeneaile with a case sty

Within he LEXCON poject work on auomac EC1131 3 ST coe generaton is on pogress n hs sense,rther eseach inclues incemenal esign aiaionsusing auomaicay geneae coe as well asauomacaly generae cosmulaton conguraion les.

CKNOWLEDGMENT

The authos gately acknowlege he nancial supporof the Euopean Union's nfomation an Scienceechnoogies progamme for the LEXICON poect IS

200137269.

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