Re: [foxboro] FBM231 highscore per FCP270

Along these lines, are there any plans to improve the state of the DCI 
block world?  Or roll their functionality into AIN, CIN, etc.?  I for one 
find it a pain to have to configure them and then add on AINs and such as 
well to get the functionality I'm used to on non-"intelligent" I/O.  I 
have heard the official line about using IACC and control strategy 
templates, etc., but I don't have IACC and don't plan to use it.  And I 
suspect everyone will be using DCI more and more as the field devices get 
more intelligent.

Corey Clingo
BASF Corporation






"Johnson, Alex P \(IPS\)" <alex.johnson@xxxxxxxxxxxxxxxx> 
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Re: [foxboro] FBM231 highscore per FCP270






The limiting factor is not the baud rate of the PIO bus, but rather the
protocol used to access the FBMs. A 2Mbps link can easily move more than
125K Bytes per second and that's more data than one would need for even
a large number of FDSI FBMs.

However, DCI (RIN, ROUT, BIN, BOUT, etc.) blocks are relatively
inefficient for whatever reason so you do see a higher than expected I/O
loading with FDSIs.

The latest FCP270 spreadsheet is pretty accurate on DCI blocks as I
understand it.


Regards,
 =

Alex Johnson
Invensys Process Systems
10900 Equity Drive
Houston, TX 77041
713 329 8472 (voice)
713 329 1600 (switchboard)
713 329 1944 (fax)
alex.johnson@xxxxxxxxxxxxxxxx
http://ips.invensys.com =




 
 
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