Re: [foxboro] AIM Historian

Hi Terry,

You can try one of these:

1. Write your code using AIM's ODBC driver through a linearized DSN (at
15 min in your case) so that you get only two values per tag at each
query. You'll have to test if you can use the AIM write-back tags
through the ODBC, I've never tried it.

2. Buy RT-DBM for Windows from Invensys Canada and expand the sample
client application to do your job. You'll have optimized reads and
writes bypassing the AIM, you can even have the alarming level read from
block parameters that the operator may want to set on the DCS side.

3. Expand your system with an InFusion MESH segment, implement the
Engineering Station only (with the Galaxy, the smallest I/O count and
the IEE), use the IADAS to access the DCS points across the ATS and
solve your problem with a couple of ArchestrA objects.



Hope this helps,

Alex Dumitru, Eng.
SI & IT
Invensys Systems Canada Inc.
Phone: (514) 421 8073
Fax:   (514) 421 8054




-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Doucet, Terrence
Sent: Friday, September 28, 2007 8:07 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] AIM Historian

Martijn,

Thank you for your suggestion.  I did think about DTIME but at 10 =3D
buckets per block with 10 seconds period that means 9 DTIME blocks per =3D
(15 minutes) signal or 900 DTIME blocks.  I was hoping that a single =3D
C-program reading an ascii file listing all my C:B.P of the signals then
=3D setting a BOOL.VALUE (if TRUE) would be much easier to maintain. The =
=3D
values are already inside the Historian.

We also looked at using IND blocks to move the measurements through a =3D
matrix every 10 seconds for 15 minutes. On a test bed, this worked fine
=3D but for the 100 signals, the memory required  in the CP is too high to
=3D make this practical.

I appreciate your response and it may be the way to go in the end but it
=3D makes the maintenance of this application a little difficult if a =3D
specification change (eg. 20 minutes instead of 15 minutes) is required
=3D later.

Terry



-----Message d'origine-----
De : foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
=3D De la part de m.d.
Envoy=3DE9 : September 28, 2007 2:55 AM
=3DC0 : foxboro@xxxxxxxxxxxxx
Objet : Re: [foxboro] AIM Historian

Terry,
I would solve this in control.=3D20
Using a DTIME block to do the 15 min delay and an AIN or REALM block to
=3D do the alarming. The loops can run at regular processing period (0,5
or =3D
1 sec).=3D20

Martijn Daamen
Senior Application Engineer
Invensys Systems N.V./S.A.=3D20
Kontichsesteenweg 54
2630 Aartselaar - Belgium=3D20
T: +32 (0)3 205.14.56  =3D20
F: +32 (0)3 232.17.98
M: +31 (0)6 22267610
martijn.daamen@xxxxxxxxxxxxxxxx
www.invensys-systems.be=3D20


----- 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 =3D
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 =3D
Historian)=3D3D20 minus the value 15 minutes ago and set a flag if the =3D
difference is greater than=3D3D20 a fixed value.  (5 sec / sample =3D3D3D =
=3D
180 samples / 15 minutes) *100

What is the best way to read the two values?  =3D3D20 We would like the =3D=

caulculations to be performed about every 10 seconds.

Does anyone have experience with similar applications using AIMAPI or =3D
AIM*DataLink?

Thanks,

Terry


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