Re: [foxboro] 12 hour ave

Brian,

One possibility is to go ahead and use a reduction group (or groups).  Write
an ACE report (assuming legacy historian) to extract that reduced value,
schedule the report periodically via cron, and write back in to a value
block or a shared variable.

This is kind of kludgy for a single value, but (unlike block logic) it is
easy to expand to do many rolling averages.

Alternatively, to view larger amounts of reported data, instead of writing
to value block or shared variable you can format a display manager screen to
veiw an ascii file, or use a scroll region on a Foxview graphic.

Regards,

Kevin FitzGerrell
Systems Engineer
Foxboro New Zealand
+64 9 573 7690

----- Original Message ----- 
From: "Brian Long" <blong@xxxxxxx>
To: <foxboro@xxxxxxxxxxxxx>
Sent: Thursday, February 26, 2004 2:08 PM
Subject: Re: [foxboro] 12 hour ave


> I need a rolling 12 hour average that the operators can watch, otherwise
I'd
> use a reduction group.  Thanks for the help.
>
> -----Original Message-----
> From: foxboro-bounce@xxxxxxxxxxxxx
> [mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Schouten, Frits JF
> Sent: Wednesday, February 25, 2004 6:24 PM
> To: 'foxboro@xxxxxxxxxxxxx'
> Subject: Re: [foxboro] 12 hour ave
>
>
> Do you want a rolling average or an average per shift or what?
> Reduction groups can help you a fair bit.
> Filtering and cascading blocks can do it too.
> Perhaps use cascading DTIME blocks.
> Utilise the bucket array to first average 10 seconds, then feed the
average
> into the next DTIME block and average 10 of 10, and then 10 of 100 and
then
> 10 of 1000 and then......
> 12 hour seconds is 43200 samples. Fair bit to go.
>
> Cheers,
> Frits.
>
>
> -----Original Message-----
> From: Brian Long [mailto:blong@xxxxxxx]
> Sent: Thursday, 26 February 2004 12:54
> To: Foxboro
> Subject: [foxboro] 12 hour ave
>
>
> I need to take an analog input running at 1 sec and average it over 12
> hours.  I need to display the value so I can't use the historian
functions.
> Anybody got a simple solution?
> Thanks,
> Brian Long
> E&I Superintendent
> Green Bay Packaging
> Arkansas Kraft Division
>
>
>
>
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