Re: [foxboro] filter 4-20 signal
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 28 Apr 2005 09:53:00 -0400
Actually, you can feed the buckets into the SSEL block and tell it to
average the inputs.
This is simpler and easier to configure than the CALC block.
Regards,
Alex Johnson
Invensys Process Systems
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Clement, Mark (KIDDMET)
Sent: Thursday, April 28, 2005 8:37 AM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: Re: [foxboro] filter 4-20 signal
The DTIME's buckets are accessible (connectable) - so you could tie the
buckets to a calc block and do moving averages=20
my 2 cents
Mark
-----Original Message-----
From: Corey R Clingo [mailto:clingoc@xxxxxxxxxxxxx]
Sent: Thursday, April 28, 2005 9:27 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] filter 4-20 signal
The DTIME block has some options that will do this. I believe it can =
take=20
several samples of an analog value and then spit out an average. =
However,=20
it is not "rolling"; in other words, it gathers, say, 10 samples, and =
on=20
the 10th it outputs an average.
To get a rolling average, we have used CALC/CALCA blocks here. I've =
seen=20
at least two implementations. I can post some CALC code if you like.
And of course the filtering option on the AIN is there...
Corey Clingo
BASF Corp.
"Dirk Pauwels" <dirkpauwels_1@xxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
04/28/2005 05:15 AM
Please respond to foxboro
To: foxboro=20
cc:=20
Subject: [foxboro] filter 4-20 signal
Does any of you guys know how to "filter" a 4-20 signal? I have a temp
signal that varies a lot from 20=B0c to 40=B0c, we plan to use it in=20
automation,
but I need to get rid of the "peaks", so if the average temp in a =
1minute
time periode is approx 35=B0 but it showed peaks from 22 to 38,I need =
to=20
show
the operator the avgtemp of 35=B0 and use this avg temp in the auto =
control.
I'm using a sequence now, but I'm sure there are far better sollutions.
Thanks & Rgds,
Dirk Pauwels - DCS coordinator
Engineering dept.
Lawter International BVBA
An RSM Company
Ketenislaan 1c ? Haven 1520
B-9130 Kallo, Belgium
T. +32.(0)3.570.95.97/ Mob. +32.(0)497.428.300
F. +32.(0)3.570.16.09
E mail: dirk.pauwels@xxxxxxxxxx
=20
=20
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