Re: [foxboro] Block resource usage listing

OK, thanks for hanging with me on this.  To summarize what I understand:
Devices involved                Message
----------------------------------------
CP->all FCMs            Multicast to initate
                                FBM polling

(CP waits a bit)

CP->FCM1                        Request for data
FCM1->CP                        Data returned

CP->FCM2                        Request for data
FCM2->CP                        FCM busy/not ready

(CP waits a bit)

CP->FCM2                        Re-request for data
FCM2->CP                        Data Returned

CP->FCM3

....and so on.  Next BPC starts all over again.


I presume this is different from the older CPs, since as you mentioned, 
the FBIs are not intelligent like the FCMs.  I'm still not clear how this 
impacts the CP60's idle time unless this waiting on the FCMs is counted 
against it.

Also, does this imply that maybe one shouldn't have the full 4-baseplate 
complement of 200-series FBMs per FCM?

Thanks,

Corey Clingo
BASF Corp.







"Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
04/19/2004 05:55 PM
Please respond to foxboro

              To:  foxboro 
              cc: 
         Subject:       Re: [foxboro] Block resource usage listing






One message to all FCMs in a BPC to initiate request of data from FBMs.

Generally, one request per FCM to retrieve data, but that could be off 
esp.
on the first FCM. Since all FCMs are working in parallel, the other ones
should be ready by the time the first is complete.

Regards,

Alex Johnson
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (operator)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
For the latest information on ArchestrA, go to
http://www.invensys.com/Archestra.html.






 
 
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