Re: [foxboro] DTIME block
- From: "Putman, Robert" <Robert.Putman@xxxxxxxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 14 Feb 2013 14:28:58 +0000
Not sure if this is helpful but this is what I found on the DTIME block in
BO193AX.
When DTOPT is not set, the incoming measurement samples at each block execution
period are
averaged over the shift time period, for example to avoid loss of signal
resolution. The average
measurement values are shifted through the bucket brigade. To avoid rapid
change of the output
signal at each shift time, the output undergoes linear interpolation between
the last two "oldest"
stored values during each block execution time.
When DTOPT is set, the averaging of incoming measurement samples is disabled
and, at each
deadtime block execution, the current measurement value (MEAS) is directly
stored into the
"newest" bucket, while the block output is updated each deadtime block
execution with the value
from the "oldest" bucket.
Looks like the averaging is done on the 1st 2 buckets only.
What is your delay (DT) set to?
Did you try with DTOPT not set and 2 buckets (NUMBKT = 2)?
Bob
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Rguercio@xxxxxxx
Sent: Thursday, February 14, 2013 9:12 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] DTIME block
Has anyone else had trouble with the DTIME block not functioning as advertised?
We are running V7.1.1 on the Unix side and 8.3 on the mesh side.
Can't seem to get the running average out of the block (yes, I know it's
averaging the input, but I'd be happy with that - we tested it by simulating an
input and can't get that feature to work). Have tried with FOLLOW on and
OFF, DTOPT 0 and 1, BKTS from 1 to 10, varying the DT, etc. I'm thinking it's
buggy (at least for our Rev) and there might be a QF I'm unaware of.
Anybody?
Rick Guercio, P.E.
RG Consulting
918 E Desert Shrub Drive
Washington, UT 84780
713-805-8742 cell
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