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
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