Re: [foxboro] FBM224 and ProSoft modules

This is a good question, though the FBM's scanning may be independent of 
the CP's processing cycle (in my installation, the activity lights on the 
FBM are about 180 degrees out of phase with the activity lights on the 
FCMs).  There probably ought to be some way to "phase" the serial link 
polling, though in Foxboro's defense, I haven't seen this capability for 
serial links on other control systems I've dealt with, either.  I guess I 
always got around any problems there by either slowing down the polling, 
or speeding up the serial link.

One other thing I'm curious about is whether, in a multidrop 
configuration, the FBM224 will continue to poll good devices while trying 
failed ones.  The brand H version of the FBM224 would not, and we often 
had to work around that.


Corey Clingo
BASF Corp.


P.S. I replied to Alex's response :-), but it went to /dev/null 
apparently...too long to repeat right now.







"Bakke, Richard A" <rabakke@xxxxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
01/24/2005 11:05 AM
Please respond to foxboro

              To:  foxboro 
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         Subject:       Re: [foxboro] FBM224 and ProSoft modules






Concerning FBM224 Scan rate and Phasing:

Related to item 2 of Corey's comments, does anyone know how to phase out
the scanning?  As mentioned, you can set the frequency (0.5 sec, 1 sec,
2 sec, etc.), but when we set up our FBM224 last summer we could find no
way to phase the scanning.  So, even with longer frequencies, everything
appears to happen at phase 0, as viewed on the activity lights.

Which brings up another question:  other than activity lights, does
anyone know how to view the communication loading from the FBM224 to the
PLC's?  The CP60 station block does not help (like the Int30 station
block did).

thanks,
Rich Bakke
Longview Fibre Co.








 
 
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