Re: [foxboro] Modbus gateway question

I'm not sure I understand what you original question was about.  If you are
asking can the gateway talk to more than one PLC, the answer is yes.  There
are a number of ways to do this depending on how you connect to the PLC's.
One person has already suggested using RS-485 which can be daisy chained to
multiple PLC's.  The more data you poll, the longer it takes so you have to
slow down the polling and phase the blocks.  We have Integrator 30's talking
to multiple remote PLC's using RS-232/RS-485 converters and modems over
leased telephone lines at 19.2K baud.  It's a bit of a kludge, and the
polling is slow (15s range), but works pretty well.  I have not tried using
additional ports on a gateway or integrator.

Roger B. Smith
Process Control Engineering
Department of Watershed Management
City of Atlanta
2440 Bolton Rd., NW
Atlanta, GA  30318
404.350.4952

 -----Original Message-----
From:   foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Ken.E.Moore@xxxxxxxxxxx
Sent:   Wednesday, November 17, 2004 8:44 AM
To:     foxboro@xxxxxxxxxxxxx
Subject:        Re: [foxboro] Modbus gateway question


This coming holiday we will be installing a new AW51F (host) to our system
running ver 7.0,
we will also be adding a CP60 and several of the 200 series FBM's. The rest
of our system will
remain at version 6.3 (3 "B" boxes).
Is the FBM224 a viable option for us?

thanks,

Ken Moore





"Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>@freelists.org on
11/16/2004 06:14:31 PM

Please respond to foxboro@xxxxxxxxxxxxx

Sent by:    foxboro-bounce@xxxxxxxxxxxxx


To:    foxboro@xxxxxxxxxxxxx
cc:     (bcc: Ken E Moore/US/NSC/ICI)
Subject:    Re: [foxboro] Modbus gateway question


Ken,

Re: "peer-to-peer" Modbus
I'm not aware of a 'peer-to-peer' version of Modbus. Can you tell me more
about what you are using and the configuration? This sounds odd to me.


Re: General use of Modbus Gateway (MDGW) and Modbus Device Integrator (MGI)
The MDGW and MDI are both Modbus RTU masters and control the link.

In general, one puts multiple slave devices on the link and let the one
port
serve them all.

There are extra ports (4 on the CmP15/DI15 HW and 2 on the CmP30/DI30 HW),
but they have an impact on each other. The overall performance of the
device
does not improve (in fact it declines) if they are used separately.

I'm pretty sure that this is covered in the manual, but it's been a while.
Do you need a copy?

I don't suppose you have a CP60 at V6.5.x? If so, you could use the FBM224.



Regards,

Alex Johnson
Invensys Process Systems
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Ken.E.Moore@xxxxxxxxxxx
Sent: Tuesday, November 16, 2004 3:38 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Modbus gateway question


I currently have a modbus gateway that is connected to a Texas Instruments
PLC, via peer to peer.
Is it possible to add an additional peer to peer connection on the second
port?
If I upgrade to an Integrator 30 , would two peer to peer connections be
possible?


thanks,

Ken Moore
NSCC-Wdrf PLant



______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________


_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html

foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave



_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html

foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave



__
This email has been scanned for Viruses and Spam.  For more information
 please contact your local Information Security representative.





______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email 
______________________________________________________________________
 
 
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
 
 
 
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave

Other related posts: