Re: [foxboro] AIM Historian

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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