Re: [foxboro] AIM Historian

Martijn,

Thank you for your suggestion.  I did think about DTIME but at 10 =
buckets per block with 10 seconds period that means 9 DTIME blocks per =
(15 minutes) signal or 900 DTIME blocks.  I was hoping that a single =
C-program reading an ascii file listing all my C:B.P of the signals then =
setting a BOOL.VALUE (if TRUE) would be much easier to maintain. The =
values are already inside the Historian.

We also looked at using IND blocks to move the measurements through a =
matrix every 10 seconds for 15 minutes. On a test bed, this worked fine =
but for the 100 signals, the memory required  in the CP is too high to =
make this practical.

I appreciate your response and it may be the way to go in the end but it =
makes the maintenance of this application a little difficult if a =
specification change (eg. 20 minutes instead of 15 minutes) is required =
later.

Terry



-----Message d'origine-----
De : foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] =
De la part de m.d.
Envoy=E9 : September 28, 2007 2:55 AM
=C0 : foxboro@xxxxxxxxxxxxx
Objet : Re: [foxboro] AIM Historian

Terry,
I would solve this in control.=20
Using a DTIME block to do the 15 min delay and an AIN or REALM block to =
do the alarming. The loops can run at regular processing period (0,5 or =
1 sec).=20

Martijn Daamen
Senior Application Engineer
Invensys Systems N.V./S.A.=20
Kontichsesteenweg 54
2630 Aartselaar - Belgium=20
T: +32 (0)3 205.14.56  =20
F: +32 (0)3 232.17.98
M: +31 (0)6 22267610
martijn.daamen@xxxxxxxxxxxxxxxx
www.invensys-systems.be=20


----- Original Message ----
From: "Doucet, Terrence" <tdoucet@xxxxxxxxxxxxxxxxxx>
To: foxboro@xxxxxxxxxxxxx
Sent: Thursday, 27 September, 2007 9:41:41 PM
Subject: [foxboro] AIM Historian


List,

We have AIM*Historian gathering thousands of measurements every 5 =
seconds.

On the same AW70 we would like to write a C program..

For 100 measurements,
we want to look at the latest value (either current or last written to =
Historian)=3D20 minus the value 15 minutes ago and set a flag if the =
difference is greater than=3D20 a fixed value.  (5 sec / sample =3D3D =
180 samples / 15 minutes) *100

What is the best way to read the two values?  =3D20 We would like the =
caulculations to be performed about every 10 seconds.

Does anyone have experience with similar applications using AIMAPI or =
AIM*DataLink?

Thanks,

Terry


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