Re: [foxboro] filter 4-20 signal
- From: Corey R Clingo <clingoc@xxxxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 28 Apr 2005 09:27:21 -0400
The DTIME block has some options that will do this. I believe it can take
several samples of an analog value and then spit out an average. However,
it is not "rolling"; in other words, it gathers, say, 10 samples, and on
the 10th it outputs an average.
To get a rolling average, we have used CALC/CALCA blocks here. I've seen
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
cc:
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°c to 40°c, we plan to use it in
automation,
but I need to get rid of the "peaks", so if the average temp in a 1minute
time periode is approx 35° but it showed peaks from 22 to 38,I need to
show
the operator the avgtemp of 35° 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
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