Re: [foxboro] Foxboro DCS to other DCS communication
- From: "Gonzalo Diaz" <gdiaz@xxxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 9 Jan 2008 14:53:43 -0200
We're using Modbus to communicate IA with a Wonderware SCADA system; =
being
IA a Modbus Master. It's not the best protocol for an app to app =
connection,
but it has been working quite fine, though.=20
I know that sometimes may be hard to implement, but i recommend to avoid =
"in
between" linking devices. Away that this is adding an extra failure =
point to
the link, you're adding extra work when changing the data exchange =
tables
for the applications.=20
Gonzalo Diaz
Mantenimiento Planta LPG
Servicios Buproneu S.A. (Capex S.A.)
Yacimiento "Agua del Caj=F3n"
TE: ++54 299 493 1200 int 260
gdiaz@xxxxxxxxxxxxxxxxx
-----Mensaje original-----
De: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] =
En
nombre de David Vergara S. (SANTAFE - CMPC Celulosa)
Enviado el: Martes, 18 de Diciembre de 2007 08:33
Para: foxboro@xxxxxxxxxxxxx
Asunto: Re: [foxboro] Foxboro DCS to other DCS communication
Hello Michael.
let me tell you a story about connecting Honeywell TDC 3000 and I/A
7:
*.- The first idea was to use OPC. It was discarded... I don't know =3D =
why...
*.- The first attempt was to use modbus with rs485 interfaces both =3D =
sides,
but the communication didn't work.
*.- Then it was used modbus with rs232 interfaces and media converters =
=3D to
fiber optics (only three wires TX, RX, GRND), but the communication =3D =
didn't
work.
At that moment it was suspected that there was a problem with flow =3D =
control
or something like that, but an "in deep" analysis shows us that =3D =
neither of
both DCS can work as "full slave". It was tried to use =3D Honeywell as =
Master
and Foxboro as Slave. the problem is that the =3D Honeywell DCS can't be
configured as slave nor configure its retry time. =3D This last =
condition
"saturate" the Foxboro interface freezing the =3D communication (I
suppose).=3D20
*.- Finally, an incredible solution... a micrologix 1500 in the middle, =
=3D
with modbus prosoft interface and RS232 to fiber converters
What do you think about this?
I am sure, there must be better ideas.
-----Mensaje original-----
De: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]En
nombre de Jaudon, Mike
Enviado el: Lunes, 17 de Diciembre de 2007 15:25
Para: foxboro@xxxxxxxxxxxxx
Asunto: [foxboro] Foxboro DCS to other DCS communication
I was wondering if anyone is communicating between two different DCS
systems, such as Foxboro I/A Series and Delta V.
=3D20
If so,
1) How are you communicating between the two systems?
2) Are you performing controls across the communication link or just =
sending
non-control data back and forth?
=3D20
Michael L. Jaudon=3D20
TRONOX, LLC=3D20
(Technology Group-Hamilton, MS)=3D20
(662)343-8710 Office=3D20
(662)304-0313 Cell=3D20
mike.jaudon@xxxxxxxxxx=3D20
If you are not the intended recipient of this e-mail message, any use,
distribution or copying of the message is prohibited. Please let me =
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immediately by return e-mail if you have received this message by =
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then delete the e-mail message. Thank you.
=3D20
=3D20
=3D20
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This mailing list is neither sponsored nor endorsed by Invensys Process
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