Re: [foxboro] Modbus Multidrop
- From: "Airhart, Chad M." <Chad.Airhart@xxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 6 Sep 2007 08:34:01 -0500
On one integrator we currently are direct connected to a data server
from ABB that provides analyzer data using Modbus protocol from the
RS-232 port. We will be adding a server from another GC vendor
(Siemens) to do basically the same thing in the same way. =20
The other integrator will be connecting to two different redundant pairs
of Detector Electronics controllers for gas detectors. These
controllers have 485 terminal connections to provide Modbus by. The
only conversion would have to be to the P0970VB configuration selector
which has the 25 pin 232 D connector.
I assume in both cases the dip switches on the P0970VB configuration
selector are set as if talking to a 584 PC. The first integrator is set
that way now. The manual is not real clear.
Chad M. Airhart=20
Principal Engineer - Lyondell Chemical Co.=20
Instrument, Electrical and Control Systems Engineering=20
Victoria Plant=20
Ph. (361)572-2568=20
Fx. (361)572-2541=20
Cell. (361)935-3230
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Kevin Fitzgerrell
Sent: Wednesday, September 05, 2007 7:12 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Modbus Multidrop
Chad,
Although the J478 modems have been around for a long time they work
well. They appear to be in the current catalog:
http://ecatalog.squared.com/pubs/Automation%20Products/Programmable%20Lo
gic%20Controllers%20(PLCs)/8000PL9602R3-07.pdf
What kind of devices are you using?
Regards,
Kevin FitzGerrell
On 9/6/07, Airhart, Chad M. <Chad.Airhart@xxxxxxxxxxxx> wrote:
> We have two Foxboro Integrator 30's for connection to devices with=20
> Modbus. I now have to connect multiple devices to each Modbus=20
> integrator so I want to do a multidrop for each. Each integrator=20
> connects to a P0970VB configuration selector. The manual shows that=20
> card going to a J478 or J878 modem then modbus bus connected to a J478
> or J878 modem at each device. The only J478 or J878 modems I found on
> the internet look like 1970's vintage boxes. How are you guys doing=20
> multidrop (where each connected device is via RS-232) and with which=20
> equipment (vendor/model numbers)? Looking for standard off the shelf=20
> equipment if possible. Any help would be appreciated.
> Chad M. Airhart
> Principal Engineer - Lyondell Chemical Co.
> Instrument, Electrical and Control Systems Engineering Victoria Plant=20
> Ph. (361)572-2568 Fx. (361)572-2541 Cell. (361)935-3230
>
>
>
>
> ______________________________________________________________________
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=20
=20
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