Re: [foxboro] Compound loading limits

I'm not browsing my I/A documentation at the moment, but I thought that 
limit was for Level 1 ECBs.  In this context, I'm assuming "Level 1" would 
be FBMs, say, and "Level 2" would be individual devices on an FBM. 
Otherwise I'd be very worried that I could not hook up very many HART and 
Modbus devices to my DCI FBMs, since you have to build an ECB for each 
transmitter/valve/foreign device on those FBMs.

Corey Clingo
BASF Corp.







"Johnson, Alex P (IPS)" <alex.johnson@xxxxxxxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
08/19/2005 02:13 PM
Please respond to foxboro

              To:  foxboro 
              cc: 
         Subject:       Re: [foxboro] Compound loading limits






FGM 6.2.6 is the current release level. It has been QF'd and is being used
in the field.

The 129 level 2 ECB limit is a systems management limit for most versions 
of
the I/A Series. This limitation was added to the FGM document because it 
was
becoming an issue for some installations - like this one.

In the 6.5.x I/A release, systems management was changed for profibus
support to 250 ecbs so customers at that release should be able to use 
more
ECBs with their FBM

In FGM, it is possible to support additional ECBs (more than 129). There 
is
no checking in the station impose this limit. The issue with FGM is in
station loading and the 2000 Block Equivalence. There is a cost in 
scanning
these ECBs twice a second and the blocks are large.

For those people who do not want to sit in SMDH and turn on all of these
ECBs; there is a program (KIDSGO) documented in B0193VK (pg 125) which
implements this one-time set which will turn on all of the ecb's.

As discussed by others omset can be used to turn on all of the ecb's is 
the
FGM station.


Regards,

Alex Johnson
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77063
+1 713 722 2859 (voice)
+1 713 932 0222 (fax)
+1 713 722 2700 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx
I hope to see you at the Invensys Process System User Group meeting 
October
3-6 in Houston, TX -
www.invensys.com/usergroup2005




 
 
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