RE: Parameter PERIOD

[Ray Henry <rehenry-at-up.net>]

At 08:40 AM 4/12/2000 -0400, Bert wrote:
>
>Can Freqmod be used without encoder feedback,
>if so how?

Freqmod uses the pulses sent to the stepper as the feedback.  There is
another motion module that allows for feedback - smdromod if memory serves
me right. 

To use freqmot you will need to set several lines in your ini file.

[EMCMOT]

; Name of motion control program
EMCMOT =		freqmod.o 

; Base task period, in seconds
PERIOD =		0.00003


Each axis must have the same values for these lines.
[AXIS_0]

INPUT_SCALE =		4000	0
OUTPUT_SCALE = 	4000	0

>What is a good PERIOD time on a pentium-2 233Mhz/64MB?

The answer to that question is between you, your computer, and your
machine.  There were some posts a while back on setting a best guess.  I
think that I'd start around the value given above or 0.00004.  If you are
happy with the way that your machine handles speed changes and you still
get a decent response from your gui then they set it a little lower.  You
will soon see that the gui becomes sluggish and that's a little bit low.

Ray