Re: [foxboro] Modbus Multidrop
- From: "Kevin Fitzgerrell" <fitzgerrell@xxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 6 Sep 2007 09:11:46 +0900
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%20Logic%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
> Modbus. I now have to connect multiple devices to each Modbus
> integrator so I want to do a multidrop for each. Each integrator
> connects to a P0970VB configuration selector. The manual shows that
> 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
> multidrop (where each connected device is via RS-232) and with which
> equipment (vendor/model numbers)? Looking for standard off the shelf
> equipment if possible. Any help would be appreciated.
> Chad M. Airhart
> Principal Engineer - Lyondell Chemical Co.
> Instrument, Electrical and Control Systems Engineering
> Victoria Plant
> Ph. (361)572-2568
> Fx. (361)572-2541
> Cell. (361)935-3230
>
>
>
>
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