Re: [foxboro] CPU loading Accuracy in STATION block (was CP Load)
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Wed, 25 Jun 2003 13:23:40 -0400
All,
I have learned from a highly placed source inside the company that due to
the resolution of the real-time clock (20 ms), the accuracy of each loading
calculation is as follows:
BPC Max. Error Usefulness
0.1 s 20.0 % not very
0.2 s 10.0 % marginal
0.5 s 4.0 % OK
1.0 s 2.0 % OK
2.0 s 1.0 % OK
Thus, it is not that the STATION block does not work at faster BPCs, but
that the measurement accuracy degrades substantially when the BPC is less
than 0.5s (500ms).
Does this make sense?
Regards
Alex Johnson
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (office)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
For the latest information on ArchestrA, go to
www.invensys.com/Archestra.html.
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
Other related posts:
