Re: following error question

[Dam <damg-at-1st.net>]

Richard Everett wrote:

>Thanks Jon.  I knew velocity 10 would mean 600ipm, I was just trying to test
>out the 1.4ghz machine to see if it would bog down.
>
>I have not messed with CYCLE_TIME (it is still 0.001 for x,y an z), but I
>know I have done more than 1000 steps per second.  I measured 5khz step
>pulses on my oscilloscope.  How exactly does CYCLE_TIME effect max
>steps/sec, and what do you think is going on in my case?
>
>Richard
>

Richard

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