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 =


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Goldie, Shaun S
Sent: Wednesday, May 28, 2008 3:25 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM231 highscore per FCP270

Andreas im not claiming the record but..
this is a good opportunity for a Foxboro member of the list to chip in
and explain to us CP Fieldbus loading especially when it comes to DCI
blocks

the FCP270 has an obvious bottleneck with a 2Mbaud fieldbus that can be
connected to multiple 100Mbaud Ethernet FBM's

my experience I loaded a fbm233 with the maximum 2000 DCI blocks and set
the transaction rates to 100mS ethereal was showing 20000 registers per
second on the wire but my CP I/O load was bugger all due to the fact the
Test PLC had no changing values

at the other end of the scale we were using a CP60/FBM224 to read a PLC
and chose to read the discrete inputs directly rather than mapping the
bits into registers the I/O loading was going up quickly leading us to
assume that a binary DCI block consumed the same I/O load as a register
block

there is a caution note in the documentation for FDSI, 223 & 224 FBM's
that the CP BPC must be 0.5 second or longer
Shaun

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Weiss, Andreas
Sent: Wednesday, 28 May 2008 22:08
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] FBM231 highscore per FCP270

Dear List,

who helds the record of installing maximum FBM231 (or FBM230, FBM233)
per (F)CP270?

I don't trust the FCP270 sizing spreadsheet and would like to know hoch
much FBM231 per CP270 run without any problems.

Two FBM231 per FCP270 work in my configuration but we would like to
install more than that.

Please provide also the number of blocks per FBM if possible.

Regards,
Andreas
=3D20
=3D20
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
=3D20
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:
mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Djoin
to unsubscribe:
mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Dleave
=3D20


=3D0A=3D0ANOTICE - This message and any attached files may contain
informatio=3D
n that is confidential and intended only for use by the intended
recipien=3D
t. If you are not the intended recipient or the person responsible for
de=3D
livering the message to the intended recipient, be advised that you have
=3D
received this message in error and that any dissemination, copying or
use=3D
 of this message or attachment is strictly forbidden, as is the
disclosur=3D
e of the information therein. If you have received this message in error
=3D
please notify the sender immediately and delete the message.
 =

 =

_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 =

foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave
 =



* Confidentiality Notice:
This e-mail and any associated files are intended solely for the individual=
 or entity to whom they are addressed. Please do not copy it or use it for =
any purposes, or disclose its contents to any other person. Further, this e=
-mail and any associated files may be confidential and further may be legal=
ly privileged. This email is from the Invensys Process Systems business uni=
t of Invensys plc which is a company registered in England and Wales with i=
ts registered office at Portland House, Bressenden Place, London, SW1E 5BF =
(Registered number 166023).  For a list of European legal entities within t=
he Invensys Process Systems business group, please click here http://www.in=
vensys.com/legal/default.asp?top_nav_id=3D77&nav_id=3D80&prev_id=3D77.

If you have received this e-mail in error, you are on notice of its status.=
 Please notify us immediately by reply e-mail and then delete this message =
from your system. Thank you for your co-operation. You may contact our Help=
desk on +44 (0)20 7821 3859 / 2105 or email inet.hqhelpdesk@xxxxxxxxxxxxx T=
his e-mail and any attachments thereto may be subject to the terms of any a=
greements between Invensys (and/or its subsidiaries and affiliates) and the=
 recipient (and/or its subsidiaries and affiliates).


 
 
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave

Other related posts: