Experimental Physics and
Industrial Control System

"James A. Smith" <[email protected]> · Sat, 19 Jun 2004 22:34:33 -0400 (EDT)

Hi,

I'm new to the list and am trying to learn more about EPICS after running
across a paper called "EPICS Architecture" by Dalesio, Kraimer and
Kozubal.  The paper discusses benchmarks for 68020 hardware, and I had a
question about that.  The authors state

"The benchmarks for the database scan tasks show the ability to close
4,000 analog loops per second leaving 40% of a 68020 available for the
sequencer and channel access services.  The maximum periodic repetition
rate currently available is 60Hz.  Using interrupt on end-of-conversion
hardware allows for rates higher than 60Hz."

The way I read the first sentence, it seems that a (low-level) control
loop with analog input and analog output can run at 4kHz.  (Please correct
me if I'm off-base) I'm not sure what a "periodic repetition rate" is,
though.  Would someone be able to clarify that for me?

Oh, while I'm at it, does anyone know what the smallest memory footprint
that EPICS requires?

thanks!  :-)

James

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System