Re: [foxboro] Rolling Averages

this looks simple and would probably work for us

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Jones, Charles R.
(Chuck)
Sent: Thursday, December 08, 2005 9:46 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Rolling Averages


If you don't need a large number of samples in your hourly average, a
quick and easy method is to use a DTIME block paired with a SIGSEL
block.  In the DTIME block, set the NUMBKT (number of buckets) parameter
to 8.  Also in the DTIME block, set the DT parameter to the time period
in minutes that you want your average to span.  In this example, set the
value to 60.  Each bucket will "move forward" every DT/NUMBKT (7.5 in
this case) minutes.  The first bucket will take on the average value
read since the last new value was stored.

In the SIGSEL block connect each of the eight inputs to a bucket in
DTIME (INP1 to BKT_1, INP2 to BKT_2, etc.)  Set the SIGSEL block to
calculate your average by setting SELOPT to 3. =3D20

This may work for your hourly averages.  From there, a larger solution
may accumulate and average the resulting hourly averages.

Chuck Jones
"Without deviation, progress is not possible." -- Frank Zappa



-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Wiggins, Bryan
Sent: Thursday, December 08, 2005 10:28 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Rolling Averages


We are being ask to provide some rolling averages.  They will not be =
=3D3D
official numbers.  We will use them for alarming purposes.  The power =
=3D3D
industry members might recognize these averages for continuous emission
=3D3D
mentoring.  We will want a 30 day and a 90 day rolling average.  During
=3D3D
the discussion our chemist spoke up and wanted an hourly average.  Is =
=3D3D
anybody doing this now and would you want to share?=3D3D20

=3D20
=3D20
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