[foxboro] ^pRE: Block Equivalents List
- From: "Johnson, Alex P (IPS)" <alex.johnson@xxxxxxxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Mon, 27 Mar 2006 18:21:45 -0500
Please use the sizing spreadsheets. The data that you want is all there.
Anything else is a very rough approximation.
Even the term 'block equivalents' has a different meaning in different
contexts. Generally, a BE is a certain amount of RAM (about an AIN's worth)
and/or 1/3 the time required to execute a PID loop:
1/8 ECB -> AIN -> PID -> AOUT -> 1/8 ECB == 1 loop
1/3 of a loop is one BE of processing power.
But this is really, really rough.
Regards,
Alex Johnson
Invensys Systems, Inc.
10900 Equity Drive
Houston, TX 77041
713.329.8472 (voice)
713.329.1700 (fax)
713.329.1600 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Jack.Easley@xxxxxxx
Sent: Monday, March 27, 2006 5:18 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Block Equivalents List
Does anyone have a handy-dandy list of I/O Loading block equivalents for
the most common Foxboro blocks they are willing to share? I know Foxboro
has spreadsheets available for this, and that other factors affect CP/GW
loading, but I could use a better grasp of block equivalents to quickly
check loading problems.
A list of other CP/GW loading factors such as peer-2-peer, display,
historian, and PI connections and how one calculates (rsom, sipc, etc)
how significantly they affect CP/GW loading would be useful to most of
us also.
Appreciate it ...
Jack Easley
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