Can I use the USB-6002 DAQ to generate a pwm signals?

[shidalgo]

Yes. Actually I got a response from the NI support in Germany and they sent me the table that I attached here. It's a list of NI modules recommended for PWM generation.

About the software PWM generation, what do you understand by "low frequency"? How much is low?

Thanks for your help.

[jesLVbcn]

I think the PWM signal by software behabiour is unpredictable because depends on the tasks you're running in your system which introduce a lot of JITTER.

You don´t have repeatibility. I think I would be confortable with PWM signals generated by software around 1 Hz. 

[ikaiser]

True, I'd only use software-generated PWM for hardware that will not break and does not control crucial applications. For dimming an LED it's find, for dimming a lightbulb that will burn if at "1" for a second or so, I would not use it.

About the rate there is also another limitation: The standard windows times has a resolution of 1ms. Implementing a PWM much faster than 50Hz does not make much sense.