Re: [foxboro] AIM Historian
- From: "m.d." <mdaatje@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Fri, 28 Sep 2007 06:54:36 +0000 (GMT)
Terry,
I would solve this in control.
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).
Martijn Daamen
Senior Application Engineer
Invensys Systems N.V./S.A.
Kontichsesteenweg 54
2630 Aartselaar - Belgium
T: +32 (0)3 205.14.56
F: +32 (0)3 232.17.98
M: +31 (0)6 22267610
martijn.daamen@xxxxxxxxxxxxxxxx
www.invensys-systems.be
----- 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)=20
minus the value 15 minutes ago and set a flag if the difference is
greater than=20
a fixed value. (5 sec / sample =3D 180 samples / 15 minutes) *100
What is the best way to read the two values? =20
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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