Interesting. One advantage to the CALC approach is that I was able to do
20 values at a time, where the SIGSEL limits you to 8.
Corey Clingo
BASF Corp.
"Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
04/28/2005 08:53 AM
Please respond to foxboro
To: foxboro
cc:
Subject: Re: [foxboro] filter 4-20 signal
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.
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