Control stepper motor

[JefVG]

Hi,

I need to drive a steppermotor (with a stepper driver). For this I'm using a cDAQ-9714 and a NI-9472. The speed of the stepper motor has to follow the profile on the figure below:

How could I do this?

I have tried something but I'm not able to control the number of steps with is (because I use continuous samples).

[Kevin_Price]

What DAQ hardware do you have for this?  In a previous thread a couple months back, I didn't think your hardware would support what you're trying to do.  Did I get that wrong?  Or have you upgraded your cDAQ chassis?  One way or the other, is your hardware in fact capable of buffered counter pulse train output? 

-Kevin P

[JefVG]

Hi,

I'm using the cDAQ-9714 chassis. I'm able to accelerate but, I can't stop after N-samples.

[Kevin_Price]

Have you confirmed that your hardware will generate the buffered frequencies you calculate?  Have you tried Finite Sampling instead of Continuous?

Note: you should write the buffer of freq/duty cycles before calling DAQmx Start.  The query of "Is Task Done?" is mainly for Finite Sampling tasks -- a Continuous task should *never* be done.  The trajectory you made is linear by index, but is by *no* means linear by time.

-Kevin P