Re: [foxboro] Data retrieval from reduction groups
- From: "Nadeau, Sylvain" <snadeau@xxxxxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 18 Jan 2002 11:34:09 -0500
Ulrich,
fh_FdbReduction() should be used for extracting the reduced data.
The file reduction mechanism is independent of the reduction groups.
Basically, when turned on, the rtp data gets reduced in files regardless if
you have reduction groups defined or not.
The extraction algorithm will decide if it will use the data from the
reduced files or from the rtp raw data files when you make your query for
the data.
Please refer to section "Overview of RTP Data File Choice" of the AIM 3.1
User's guide (around page 190) for a discussion on this topic.
PS: I think that the SUM operation always uses "reduction on the fly".
Regards,
Sylvain.
Sylvain Nadeau
Systems Integration & IT
Invensys Process Systems
Foxboro Canada Inc.
snadeau@xxxxxxxxxx
514-421-8107
Fax:514-421-8054
-----Original Message-----
From: Ulrich Wieczorek [mailto:uwieczorek@xxxxxxxxxx]
Sent: January 17, 2002 8:54 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Data retrieval from reduction groups
Sylvain,
thanks for the reply. I assume you think of fh_FdbGetValues() as
one of the extraction functions. How do I tell the funcion to retrieve
the data from the reduction groups and not from the historian? Do
I have to specify its name in the first (historian) parameter of the
function?
Regards,
Ulrich
> Ulrich,
> You first have to set-up your AIM* historian instance to generate
> reduction
> files. This is done by setting the following instance attributes:
> REDUCLEVEL = 1
> USEREDFILES = YES
> Setting USEREDFILES = YES enables the use of the
> reduction files by the extraction functions.
> You also have to configure these instance attributes:
> PCTVALID
> REDUCPHASE
> REDPHASEUNIT
> SCANPEAKS
> REDFASTUNIT
> REDMEDUNIT
> REDSLOWUNIT
> REDFASTINT
> REDMEDINT
> REDSLOWINT
> Regards,
> Sylvain.
> Sylvain Nadeau
> Systems Integration & IT
> Invensys Process Systems
> Foxboro Canada Inc.
> snadeau@xxxxxxxxxx
> 514-421-8107
> Fax:514-421-8054
> -----Original Message-----
> From: Ulrich Wieczorek [mailto:uwieczorek@xxxxxxxxxx]
> Sent: January 17, 2002 1:28 AM
> To: foxboro@xxxxxxxxxxxxx
> Subject: [foxboro] Data retrieval from reduction groups
> Hi list,
> how can I retrieve collected data from reduction groups, using FoxAPI
> or AIMAPI? I don't want calculate the reduced values at runtime
> (using fh_FdbReduction()). Is there a way to retrieve the already
> collected reduced data?
> Regards,
> Ulrich
> '
> ---------------------------------
> Ulrich Wieczorek
> Erpicon Software Development GmbH
> Neusser Str. 724-726
> 50737 Koeln
> Tel. 0221-974600
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