Re: [foxboro] Extended Modbus Registers into I/A

I remember an unfortunate incident about 10 years ago when I worked with 
Foxboro's Modplus + integrator on a plant expansion project.  The PSS 
stated that it worked with all the newer Modicon controllers, which had 6 
digit addresses rather than the older controller convention of 5 digits. 
As it turned out, when a CAR was submitted, the answer was that the PSS 
would be corrected to indicate that only 5 digit addresses could be read. 
I find that the information around Modbus/Modbus+ integration is somewhat 
confusing, with conflicts between some of the different Foxboro 
documentation - clarity would be appreciated.



Stan M. Ruth, P.E.
Process Control Engineer 
Engineering - Port Neches Performance Products Site


 




"Rick Mol" <rdmol@xxxxxxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
04/26/2006 09:53 AM
Please respond to foxboro
 
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        Subject:        [foxboro] Extended Modbus Registers into I/A


Greetings, all wise and all knowing list.

We have an application where data from a Carrier chiller needs to be =
brought into the I/A via a Micro I/A.  The problem is that, per TAC, the =
Micro I/A will not read the extended Modbus registers (6 digit) 300000 to 
=
399999.  It only reads 5 digit registers (ex. 30000 to 39999).   The =
chiller only supplies register addresses in the extended range.

The FBM224 has the same limitation.  The FBM 230 will support extended =
registers, but requires the 270 series controller.

There is no option to move the registers in the chiller.  It's just a =
conversion module from BacNet to Modbus. =20

The chiller supports BacNet, so the BacNet to Modbus converter from =
Fieldserver may be an option.

Has anybody else out there ran into something like this?

Thanks and Regards,







Rick Mol
ESCO Company
IT/Automation Admin.
231.727.6409
rdmol@xxxxxxxxxxxxxxx

 
 
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