Re: following error question

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

Hi Dale

You've got my curiosity aimed at your test bench!  Are you trying to run 
real servos with step and direction from smdromod?  If so, and you can 
talk about it, how?

My second question deals with womething that we call pulse rate 
granularity.  My understanding of what is going on with freqmod is really 
limited.  I think that freqmod has to operate at divisions of the maximum 
pulse rate.  If you lower the feedrate just a bit, you should see the 
frequency generator hopping between 31250 and 15625.  If you get a 
chance, could you do just a bit of experimenting with this and share your 
findings?

Ray

On Thursday 03 October 2002 08:34 am, Dale wrote:
<s>
> I've been developing a servo system using smdromod. It is working
> pretty good on the bench.  I have observed that the period parameter is
> what determines max step pulse rate.  If period is set too small the
> computer just locks up when trying to start EMC.  On a AMD k6 450 MHz I
> am able to run with period set to 0.000016, which is 16 micro seconds. 
> With a scope on the step pin my max pulse rate worked out to be
> approximately 16 us high + 16us low = 32 us/cycle,  32 us/cycle = 31250
> Hz.
>
> Axis CYCLE_TIME as I understand it controls the rate at which the
> velocity command or pulse rate is updated. For CYCLE_TIME = 0.001 the
> velocity command or pulse rate is updated once every millisecond.  I
> have not tried setting CYCLE_TIME any lower than 0.001
>
> Dale