Copy igh © IF AC Dis ibu ed Compu e Con ol Sys ems,
Coma, I aly, 1998
COMMUNICATING
MMS
EVENTS
IN
A
DISTRIBUTED
MANUFACTURING
SYSTEM
USING
CORBA
T.
A iza'
F
.R.
Rubio·
• Depa amen o
de
Ingenie ia
de
Sis emas y A u oma ica,
Uni e sidad
de
Se illa, Escuela Supe io
de
Ingenie os,
Gamino
de
Los Descub imien os
sin
. E-41092 Se illa, Spain.
Phone: +34 95 446 7364·
Fax:
+34
95448
73
85
.
E-mail: [email p o ec ed]
Abs ac :
Nowadays,
dis ibu ed
compu ing sys ems a e widely used due
o
he
g ea
ad ances
ha
ha e been achie ed in compu e ne wo ks in
he
pas
ew
yea s,
and
pa ly
due
o
hei low cos . De eloping so wa e o hese sys ems
u ns
ou
o
be
complica ed, mainly due
o
he
he e ogenei y
o
he
dis ibu ed sys em componen s
and
he
unde g ound communica ion laye s. MMS is a sui able language
o
ca y
ou
he
communica ion be ween de ices in a he e ogeneous manu ac u ing sys em because
i
p o ides uni o mi y in
he
access
o
hem
. This wo k p oposes
he
use o
he
ORB
speci ied in CORBA om
he
OMG
o
communica e MMS e en s.
Copy igh © 1998 IFAC
Keywo ds:
Dis ibu ed models, Objec -O ien ed p og amming, Communica ion
p o ocols, E en s, Manu ac u ing Sys ems.
1.
INTRODUCTION
Dis ibu ed sys ems ha e ob ained
g ea
impo -
ance in
he
pas
ew
yea s. They ha e been in-
oduced in o a
g ea
di e si y
o
en i onmen s
and
explici ly in manu ac u ing sys ems. So
ha
,
whe e he e we e isola ed componen s,
he e
a e
now in eg a ed componen s in
he
dis ibu ed
compu ing sys em, whe e
he
communica ion
and
coope a ion be ween
hem
is
allowed.
This ad an age
is
dec eased due
o
he
he e o-
genei y o
he
de ices
ha
can be ound in
he
manu ac u ing en i onmen s. Because
o
his,
he
necessi y
o
using a common p o ocol in
o de
o
communica e hese in e connec ed elemen s
a ises.
In
addi ion
o
his, using se ices p o ided
by
he
p o ocol mus be easy om
he
poin
o
iew o
he
use applica ion.
MMS is a communica ion p o ocol widely used
in manu ac u ing dis ibu ed sys ems.
I
is
an
applica ion laye p o ocol
ha
homogenises
he
use o
he
de ices
ha
compound
he
sys em
.
MMS makes use o
he
objec o ien ed
app oach
o
speci y
he
se ices
ha
a use can in oke
o
communica e wi h hese de ices.
149
On
he
o he
hand
, dis ibu ed objec me hod-
ologies, whe e CORBA is amed, p o ide all
he
objec
o ien ed me hodology ad an ages in dis-
ibu ed
sys ems. CORBA can make
he
MMS
se ice use applica ion
o
eques
he
se ice
easie , as i allows
o
s uc u e
he
sys em in
objec s
and
a
he
same ime
o
ha e hese objec s
dis ibu ed
along
he
se e al componen s o he
sys em, making
he
dis ibu ion
anspa en
o
he
use .
Taking his in o accoun , esea ch has been un-
de aken,
bu
hey
do no deal wi h he e en
communica ion,
an
impo an
aspec o he
MMS
p o ocol
ha
allows
o
send e en no i ica ions
o
and
om manu ac u ing de ices.
The
obje i e
o
his wo k
is
o
p opose CORBA
as
he
me hodology used
o
communica e
MMS
e en s in manu ac u ing en i onmen s.
In
he
ol-
lowing sec ions,
he
aim o his
pape
will be p e-
sen ed, as well as a summa y on
he
backg ound
o i
and
he
way
o
use CORBA in o de o
communica e e en s.
2.
AIM
OF
THE
WORK
Taking
in o
accoun
he
CORBA a chi ec u e,
ha
allows
he
spli
o
he
sys em in objec s
and
communica ion o hese objec s in
an
easy way
and
aking
in o accoun
he
VMD e en manage-
men
se ices, communica ing MMS e en s and
ca ying
ou
se ice eques s by means o CORBA
is p oposed.
In
his
way,
s uc u ing
he
dis ibu ed sys em in
a
se
o
objec s
ha
a e communica ed by means
o se ice eques s
is
allowed.
Bu
his dis ibu ion
is
anspa en
o
he
use because
i
is he Objec
Bus
ha
unde akes
he
esponsibili y o ind
he
se e al
objec s
. And u he mo e,
i
is
used
o
communica e
MMS e en s
o
he
se e al VMD's.
This
wo k p oposes
o
make a ailable he MMS
se ices o
he
e en managemen by means o
he
CORBA
Objec
Bus. These se ices a e he se -
ices speci ied in
he
MMS
s anda d
.
The
ansla-
ion
scheme
o
hese se ices
o
CORBA IDL a e
going
o
be
s udied.
The
se ices o
he
e en managemen in
MMS
a e di ided in wo g oups:
The
se ices ca ied
ou
by
he
MMS se e
and
he
se ices ca ied ou by
he
MMS clien .
This
app oach
is used
o
communica e clien s
o
he
se e al Vi ual Manu ac u ing De ices by
means
o
he
ORB, using
he
MMS in e ace o
e en s.
3. BACKGROUNDS
In
o de
o
unde s and
he
wo k ca ied ou ,
MMS,
he
e en model
and
CORBA
a e going
o
be
b ie ly in oduced.
3.1
MMS
In
dis ibu ed
he e ogeneous sys ems, whe e each
de ice
has
di e en ea u es, ca ies
ou
di e en
asks
and
is p obably owned by a di e en manu-
ac u e
,
he
need
o
in e connec all de ices
ha
compound
he
sys em ises in o de
o
achie e
he
in eg a ion
o each one in
he
whole sys em.
I
is possible
o
use wo di e en ocuses o allow
he
de ices
o
communica e:
• Using
he
ools
and
he
languages p o ided
by
he
manu ac u e
o each de ice.
• Using a common language o all he de ices.
This
language mus be independen o
he
pa icula
low le el ea u es.
The
disad an ages
o
his i s app oach a e e i-
den
:
150
• The specialised s a mus lea n
he
pa icu-
la ea u es o each de ice.
• The applica ion depends on
he
de ice.
•
I
is
di icul
o
debug
and
main ain applica-
ions o hese sys ems.
The
second app oach does no ha e hese p ob-
lems, because o his,
he
enginee in cha ge
o
de eloping applica ions
ha
un
in he e ogeneous
sys ems only has
o
lea n one language. Mo eo e ,
he
applica ion
will
be independen
o
he
de ice
and
he e o e easie
o
debug
and
main ain.
Manu ac u ing Message Speci ica ion (MMS) can
be used in his second app oach. MMS
is
a com-
munica ion language o aid
he
in e connec ion
o
de ices in a he e ogeneous en i onmen .
I
is a
p o ocol
ha
alls in
he
applica ion le el
s an-
da dised by ISO (In e na ional
S anda d
O gani-
sa ion).
Al hough MMS is no a comple e Objec -O ien ed
language, as i does no
suppo
all
he
ea u es
o he Objec -O ien ed p og amming,
i
spli s
he
sys em
in
objec
and
p esen s a well de ined in e -
ace
o
each one.
The
mos
impo an
objec in
he
sys em is he Vi ual Manu ac u ing De ice
(VMD).
The
VMD hides
he
eal manu ac u ing
de ice o
he
p og amme .
The
sys em is s uc-
u ed
in
a se o VMD.
MMS
is
also based on
he
clien /se e model.
The
VMD
ac s as a se e ,
and
so ca ies
ou
a se o se ices
ha
a e desc ibed in
he
MMS
p o ocol.
The
clien s a e
he
eques e s o
he
se ices p o ided by
he
VMD.
A pa icula implemen a ion o
he
MMS se e
mus p o ide
he
mapping be ween
he
VMD
model, which is
an
abs ac ion,
and
he
unc ion-
ali y o
he
eal manu ac u ing de ice.
(
Real
De ice (
Real
De ice
Fig.
1.
Sys em based on MMS.
The
scheme o a sys em based on
he
communica-
ion p o ocol
MMS
is
showed in igu e 1.
Each
MMS
se e manages a se o objec s asso-
cia ed o
he
VMD. Some o
he
mos
impo an
a e he ollowing:
•
The
Damain
Objec :
I
ep esen s a
subse
o he capabili ies o
he
VMD which is used
o
a speci ic pu pose.
•
The
P og am
In oca ion Objec :
I
is
a
dynamic elemen which mos closely co e-
sponds
o
an
execu ion h ead in a mul i-
asking en i onmen .
•
The
a iable Objec :
I
is used
o
model eal
a iables
o
he
VMD.
O he
impo an
objec s
ha
a e managed by he
VMD a e e en s. These objec s a e explained
in
he
nex
sec ion.
In
o de
o
handle hese objec s,
he
VMD p o-
ides a se
o
se ices o hem.
A e ision
o
MMS can
be
ound in (Pimen el,
1990; CCE-CNMA, 1995)
and
a comple e desc ip-
ion
o all hese se ices
and
he
p o ocol speci i-
ca ion in
(ISO/IEC
. 9506-1, 1990;
ISO/IEC
. 9506-
2, 1990).
3.2
MMS
EVENTS
The
e en managemen se ices p o ide acili ies
which allow a clien MMS-use o de ine and
manage
e en objec s
a
a VMD
and
o
ob ain
no i ica ions
o
e en occu ences.
The
e en managemen model ex ends
he
VMD
wi h
h ee addi ional objec s and se ices
ha
wo k in hese objec s.
Each
one o hese objec s
models a speci ic aspec
o
he
s a e
in o ma ion
associa ed
o
he
MMS e en managemen . They
a e
b ie ly commen ed
on
in
he
ollowing:
•
The
E en
Condi ion Objec :
The
e en managemen model de ines wo
classes o E en Condi ion objec , Ne wo k-
igge ed e en condi ion objec
and
Moni-
o ed
E en
Condi ion objec .
The
i s one
models
an
e en which occu s due
o
he
explici eques o a clien using
he
T ig-
ge E en se ice. Al hough i also models
e en s occu ing in e nall
y,
as a esul o
au onomous VMD ac ion. The second one
is a
i ual
ep esen a ion o
an
aspec
o
he
ac i i y
o
he
VMD which ep esen s a
signi ican occu ence in he p ocessing o he
VMD.
Ei he
class
o
E en Condi ion objec
includes
he
po en ial o
VMD
ini ia ion o
E en No i ica ion se ice execu ions.
•
The
E en
Ac ion Objec :
I
models
he
po ion
o he
s a e
in o ma-
ion which
is
conce ned wi h
he
execu ion
o
MMS se ices due
o
he
occu ence o an
e en . An E en Ac ion
is
a con i med
MMS
se ice which will
be
execu ed when a speci ic
ansi ion
o
a
s a e
a ibu e
o
he
E en
Condi ion objec is de ec ed.
•
The
E en
En ollmen
Objec :
I
is
used op ionally in o de
o
bind an
E en Condi ion
objec
o
an E en Ac ion
151
objec and
o
bind
he
no i ica ions
ha
a e
esul s o an e en ansi ion
o
a clien .
I
ep esen s
he
eques o a clien
o
be
no i-
ied
o
he
occu ence o one
o
mo e speci ic
ansi ions o
he
s a e
a ibu e
o
he
E en
Condi ion objec ,
o
o delay
he
execu ion
o a con i med MMS se ice un il
he
occu -
ence o one o mo e speci ic
ansi ions
o
he
s a e
a ibu e
o
he
E en
Condi ion
s a us.
The se ices
ha
ha e been added
o
he
VMD
o manage e en s a e
he
ollowing:
•
In
o de
o
de ine
and
dele e objec s: De i-
neE en Condi ion
,
Dele eE en Condi ion,
De ineE en-
Ac ion
, Dele eE en Ac ion,
De ineE en En ollmen
,
Dele eE en En ollmen
.
•
In
o de o ob ain
and
modi y
a ibu es
:
Ge E en Condi ionA ibu es
,
Al e E en Condi ion
-
Moni o ing
,
Ge E en Ac ionA ibu es,
Ge E en En-
ollmen A ibu es
,
Al e E en En ollmen
.
• In o de o ob ain ala m
summa y
:
Ge
Ala m-
Summa y,
Ge Ala mEn ollmen Summa y
.
• In o de o in o m
abou
he
s a us
ob-
jec s:
Repo E en Condi ionS a us
,
Repo E en-
Ac ionS a us,
Repo E en En ollmen S a us.
•
In
o de o no i y e en s:
T igge E en ,
E en -
No i ica ion, Acknow ledgeE en N o i ica ion.
3.3 CORBA
The Common Objec Reques B oke A chi ec-
u e
(CORBA)
is
a dis ibu ed
objec
a chi ec u e
ha
allows so wa e objec s
o
in e ac
ac oss
ne wo ks. CORBA was i s in oduced in 1991
by
he
Objec Managemen G oup (OMG).
I
is
an
in e na ional conso ium
o
o e 800 so wa e
endo s, de elope s
and
end use s.
The aim o his g oup is
o
speci y
an
open
so wa e bus on which objec componen s
w i en
by di e en endo s can
in e ope a e
ega dless
o
he
implemen a ion language, loca ion
o
hos
pla o m.
The objec bus p o ides
an
Objec Reques
B o-
ke (ORB)
ha
le s clien s in oke
me hods
on
emo e objec s ei he s a ically
o
dinamically.
As
a esul o hei wo k, OMG app o ed a
se
o
speci ica ions -called CORBA 2.
0-
in
la e
1994.
The Objec Managemen A chi ec u e (OMA)
speci ied by OMG, is shown in igu e 2
and
con-
sis s o
he
ollowing elemen s:
• Objec Reques
B oke
(ORB)
:
I
p o-
ides
he
mechanisms by which
objec s
ans-
pa en ly make
and
ecei e eques s
and
e-
sponses.
In
doing his,
he
ORB
p o ides
in e ope abili y be ween applica ions
on
di -
e en machines in he e ogeneous
dis ibu ed
Non·s anda diud
Ve ical
Applica ion·speci ic
In e aces
App
li
ca ion
Objec s
0 0
Domain· speci ic
In e aces
Domajn
In e aces
0 0
Ho izon al
Facili y In e aces
Common
Facili ies
0 0
OBJEC
REQUEST
BROKER
(ORB)
0 0
Objec Se ices
Gene al Se ice In e aces
Fig.
2.
The
Objec Managemen A chi ec u e
(OMA) speci ied by OMG.
en i onmen s
and
seamlessly connec s mul i-
ple objec sys ems.
• Objec Se ices : They a e se ices
ha
complemen
he
unc ionali y o he ORB.
These componen s s anda dize
he
li e-cycle
managemen o objec s.
•
Common
acili ies:
Se ices o di ec use
o
applica ion objec s.
I
p o ide a se o gene ic
applica ion unc ions
ha
can be con igu ed
o
he
speci ic equi emen s o a pa icula
con igu a ion.
• Domain
In e
aces : They ep esen e i-
cal a eas
ha
p o ide unc ionali y o di ec
in e es o end-use s in pa icula applica ion
domains.
• Applica ion
Objec s:
They a e speci ic com-
ponen s o end-use applica ions. An appli-
ca ion
is
ypically buil om a la ge numbe
o basic objec s -some speci ic
o
he
appli-
ca ion
a
hand, some domain speci ic, some
om objec se ices and some buil om a
se o common acili ies.
The objec speci ica ion is ca ied
ou
using he
In e ace De ini ion Language (IDL).
I
is
a de-
sc ip i e language used o de ine he in e ace
h ough which a clien may access a se e . IDL
p o ides ope a ing sys em and p og amming lan-
guage independen in e aces
o
all he se ices
and componen s
ha
eside on a CORBA bus.
The
s a ic me hod in oca ion used by he COR-
BA's implemen a ion is shown in igu e 3 (CORBA
also de ine a dynamic me hod in oca ion,
bu
i
is
no explained
).
The
ollowing componen s a e
necessa y
o
ca y
ou
he in oca ion:
• Cli
en
IDL
s ub : Clien code used
by
an
objec o encode in oca ions in a o m which
can be handled by he ORB, and
o
decode
eplies ecei ed ia he ORB.
152
Reques
Objec
Implemen a ions
00
Objec
~=::..J
Adap e
Objec Reques B oke (ORB)
Fig. 3.
Objec
's me hod's
s a ic
in oca ion.
•
Skele on:
Se e code up-called by
he
ORB,
capable o decoding eques s
ansmi ed
by
he
ORB, con e ing
i
in o an in oca ion o
he
implemen a ion objec , and encoding
he
esul s
o
be sen back
o
he clien ia
he
ORB.
• Objec adap e :
I
de ines how an objec is
ac i a ed
.
I
can do his by c ea ing a new
p ocess, c ea ing a new h ead wi hin
an
exis ing p ocess, o by eusing
an
exis ing
h ead
o p ocess.
Mo e in o ma ion ega ding CORBA can
be
ound
in
(Objec
Managemen G oup,
1995a;
Objec
Managemen
G oup, 1995b).
4. SYSTEM
DESCRIPTION
In
o de
o
s uc u e
he
sys em and
o
adap
MMS
o
CORBA, he app oach p oposed in
(G. Guyonne , 1997) has been ollowed. This
CORBA
app oach o ISO-MMS
is
known as
COOL-MMS, because
i
has been hough o
o
he
CHORUS-COOL sys em (CHORUS Sys-
ems
, 1996).
The
ea u es o
he
sys em can be summa ised in
his way:
•
The
MMSse e
is
a CORBA objec and i s
in e ace co esponds
o
he MMS se ices
p o ided by he VMD,
i
is
de ined in a IDL
speci ica ion.
The
e en se ices ha e been
added
so
ha
e en s can be communica ed.
•
The
con i med MMS se ices a e decla ed as
synch onous in oca ion me hods.
•
The
eques
o
send unsolici ed in o ma ion
is implemen ed by means o one-way in o-
ca ion
me hods.
The
MMSse e uses he
T apSe e objec o
he
clien in o de
o
send his unsolici ed in o ma ion.
The
scheme o
he
sys em is shown in igu e 4.
Al hough
he
associa ion managemen is
no
im-
plemen ed due
o
he ac
ha
hey a e managed
by
he
ORB
, some conside a ions mus be made.
Real De ice
MM8-CUen
Fig. 4.
E en
Managemen in CORBA.
In some cases, in
he
objec s
and
se ices o
he
e en model, being able
o
indica e a speci ic
associa ion
is
impo an .
Fo example,
he
E en
En ollmen objec
has
an
a ibu e
ha
is a
e e ence
o
he
applica ion
ha
mus
be
ad ised
wi h an
E en
No i ica ion se ice when
he
s a e
o a a iable changes.
Then,
he
MMS se e
mus be capable o indica ing his
o
a clien .
In
he
s anda d
MMS,
he
applica ion e e ence is
de ined as speci ied below:
Applica ionRe e ence
{
SEQUENCE
}
ap- i le
[0] AP- i
le
OPTIONAL,
ap-in oca ion-id
[1]
AP-in oca ion-iden i ie
OPTIONAL,
ae-quali ie
[2]
AE-quali ie
OPTIONAL,
ae-in oca ion-id
[3]
AE-in oca ion-iden i ie
OPTIONAL
Bu
his in o ma ion is only meaning ul in an OSI
en i onmen . In
CORBA,
he
ollowing applica-
ion e e ence has been used:
enum
Applica ionRe e enceChoice
{
name,
e e ence
};
union
Applica ionRe e ence
swi ch
(Applica ionRe e enceChoice)
{
153
};
case
name
:
Iden i ie
ap-name;
case
e e ence:
T apSe e
ap- e e ence;
This
e e ence is
he
applica ion
name
o
he
e e -
ence
o
a T apSe e objec . Ha ing
he
e e ence,
he
MMS se e
can
communica e wi h
he
clien
di ec ly by means
o
he
ORB. O he wise, ha ing
he
name,
i
can
ob ain
his e e ence asking
o
he
Naming Se ices.
5.
EVENT
SERVICES IN CORBA
In
o de
o
ca y
ou
he
ansla ion
om ASN.1
o
idl
he
speci ica ion In e -domain Managemen :
Speci ica ion T ansla ion
o
The
Open G oup
(Open
G oup, 1997)
is
ollowed.
Nex ,
he
example
o
he
T igge E en se ice in
idl
and
he
way
o
ansla e
he
necessa y
da a
s uc u es
om ASN.1
o
idl
is
shown.
The
da a
speci ied in
he
MMS p o ocol o ealize
a
eques
and
e u n
he
esponse o
he
T ig-
ge E en
se ices
a e
he
ollowing.
Iden i ie
::=
VisibleS ing
Objec Name : :=
CHOICE
{
md-speci ic
}
[0] IMPLICIT
Iden i ie ,
domain-speci ic
[1] IMPLICIT
SEQUENCE
{
},
aa-speci ic
domainId
i emId
[2] IMPLICIT
Iden i ie
Iden i ie ,
Iden i ie
Unsigned8
::
=
INTEGER
P io i y
::=
Unsigned8
T igge E en -Reques
::
=
SEQUENCE
{
}
e en Condi ionName
[0] Objec Name,
p io i y
[1] IMPLICIT
P io i y
OPTIONAL
T igge E en -Response
::=
NULL
The
co esponding
s uc u e
in idl ob ained by
means
o
he
ansla ion
ollowing
he
speci ica-
ion
o
he
Open
G oup
a e
he
ollowing:
ypede
cha
ASN1_Null;
cons
ASN1_Null ASN1_NullValue=' xOO';
ypede
s ing
ASN1_VisibleS ing;
ypede
ASN1_VisibleS ing
Iden i ie ;
ypede
long
ASN1_In ege ;
ypede
ASN1_In ege
Unsigned8;
ypede
Unsigned8
P io i y;
ypede
ASN1_Null
T igge E en _Response;

enum
Objec NameChoice {
md_speci icChoice,
domain_speci icChoice,
aa_speci icChoice
};
union
Objec Name
s i ch
(Objec NameChoice) {
case
md_speci icChoice:
};
Iden i ie
md_speci ic;
case
domain_speci icChoice
:
s uc
{
Iden i ie
domainId;
Iden i ie
i emId;
}
domain_speci ic
;
case
aa_speci icChoice:
Iden i ie
aa_speci ic;
union
P io i yTypeOp
s i ch
(boo
lean)
{
case
TRUE:
P io i y
alue;
};
s uc
T igge E en _Reques
{
Objec Name
e en Condi ionName;
P io i yTypeOp
p io i y;
};
The
me hod
in
he
MMSse e in e ace speci ied
in idl
is:
T igge E en _Response
T igge E en (T igge E en _Reques )
aises(Se iceE o ):
Once
he
VMD in e ace
o
manage MMS e en s is
de ined in idl,
he
MMSse e objec se ices o
he
e en
managemen
can be accessed h ough
he
ORB
om
any
place in
he
manu ac u ing
dis ibu ed
sys em
.
6. IMPLEMENTATION
A
p o o ype
has
been implemen ed. The unc ion
o i
is
o
accep
eques s om
he
clien s
and
send uncon i med eques s o
hem
.
I
only deals
wi h
he
communica ion o e en s. The e en
managemen
has
no
been implemen ed,
bu
some
in o ma ion
ega ding
his can be ound in (Swiss
Fede al
Ins i ude
o
Technology, Lausanne, 1992).
The
ORB used is Ja aIDL. Ja aIDL
is
an Objec
Reques
B oke
p o ided wi h
he
JDK 1.2. To-
ge he wi h
he
idl oja a compile , i can be used
o de ine,
and
access CORBA objec s om
he
Ja a
p og amming
language. Ja aIDL
is
compli-
an
wi h
he
CORBA
2.0 Speci ica ion
and
he
IDL- o-Ja a
Language
Mapping.
Ja aIDL also p o ides a ansien namese e
o
o ganize
objec s
in o a ee-di ec o y s uc-
u e.
The
namese e
is
complian wi h
he
Naming Se ice Speci ica ion desc ibed in COR-
BASe ices:
Common
Objec Se ices Speci ica-
ion
(Objec
Managemen
G oup, 1995b).
154
7. CONCLUSION
The
aim o de eloping his wo k is
o
ad ance
in
he in eg a ion o he Vi ual Manu ac u ing
De ices (VMD) in dis ibu ed sys ems based on
CORBA.
Mo e explici ly, he
MMS
e en managemen
model has been deal wi h. By means o
he
Objec Bus de ined in CORBA, making a ailable
he
MMS
e en managemen se ices ha e been
achie ed.
In o de
o
accomplish his, he in e ace o hese
se ices ha e been buil in
id!.
S a ing
om
he
da a
speci ied in ASN.1 used by
he
p o ocol,
and ollowing he Speci ica ion T ansla ion o
The
Open G oup, he speci ica ion o hese
da a
in idl
ha e been ob ained.
In
his pape , he CORBA bases,
he
MMS and
se ices bases a e also explained.
8.
ACKNOLEDGEMENT
This wo k
is
suppo ed in
pa
by
he
CICYT
unde g an num. TAP-95-0307
9.
REFERENCES
CCE-CNMA,
ESPRlT
Conso ium (1995).
MMS
:
A Communica ion Language o Manu ac u -
ing. Sp inge .
CHORUS Sys ems (1996).
CHORUS/COOL
ORB
P og amme 's Guide. CS/TR-96-2.2.
G. Guyonne ,
E.
G essie -Soudan, F. Weis (1997).
COOL-MMS: a
CORBA
app oach o
ISO-
MMS. ECOOP'97 Wo kShop.
ISO/IEC. 9506-1 (1990). Indus ial
Au oma ion
Sys ems -Manu ac u ing Message Speci ica-
ion", Pa
1:
Se ice De ini ion. In e na-
ional S anda ds O ganiza ion.
ISO/IEC. 9506-2 (1990). Indus ial
Au oma ion
Sys ems -Manu ac u ing Message Speci ica-
ion
",
Pa
2:
P o ocol Speci ica ion. In e na-
ional S anda ds O ganiza ion.
Objec Managemen G oup (1995a).
CORBA
:
Common Objec Reques B oke A chi ec u e
and Speci ica ion. OMG, F amingham, MA.
Objec Managemen G oup (1995b) .
CORBAse -
ices: Common Objec Se ices Speci ica ion.
OMG, F amingham,
MA.
Open G oup (1997). In e -domain Managemen :
Speci ica ion T ansla ion.
X/Open
Documen
Numbe : P509.
Pimen el,
Juan
R.
(1990). Communica ion Ne -
wo ks o Manu ac u ing. P en ice-Hal!.
Swiss Fede al Ins i ude o Technology, Lausanne
(1992).
MMS
E en
Managemen . Compu e
Enginee ing Dep .