Alex,
In our case, we have more averages than we care to perform in a CP due to
loading issues. That function we were hoping to perform by the AIM
historian, since we could configure it to provide the reduction for hourly,
daily, monthly, etc. as needed. How many SVs would be available to us for
use in getting these averages displayed? And where might there be
documentation on how this could be accomplished?
Stan
___________________________________________________________________________________________________________
FV/DM get their data from an OM variable (CPB, AOA, or SV) by name.
AIM* reduces data and stores it internally. For that matter, so does the
old/legacy/data historian.
So far as I am aware the only ways to get these calculations onto a FV/DM
display are:
* Use a trend
* Write a program/script to extract the data from AIM* and put it
in a
SV periodically which probably more trouble than doing the averages in the
CP.
Regarding averages in a CP, you have a number of options, the DTIME block
can be used to generate a rolling average.
The 8 of the 10 buckets in the DTIME can be connected to one of the inputs
of a SIGSEL block and the SIGSEL can do the average of those 8 values.
Setting the DTIME delay and the SIGSEL and DTIME periods will give you the
average you want (if 8 samples is sufficient).
There are others, but these are not obvious.
Regards,
Alex Johnson
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