PWM with CompactDAQ 9174 on a DO-Module

Question

Hi all
We did a regulation of peltier elements with PWM with a cRio over FPGA on a DO-Module 9477.
We have now a small project with a CompactDAQ 9174 where we would like to regulate such peltier elements. The Frequenze should be at least 5 kHz.
As I found in the forum and the examples, with the intern counter/timer of the cDAQ9174, it is possible to generate a digital pulse train and with the duty cycle  also a PWM.
e.g.:
http://forums.ni.com/t5/Counter-Timer/Counter-Output-with-NI-cDAQ-9188/m-p/2218208#M10898
http://digital.ni.com/public.nsf/allkb/ADFC4DD8C9690232862575B70079FBD4
What I could not found, is a way to get a generatet PWM-signal out of the intern cDAQ to a DO-Module (S-Serie) such as NI7477. And I do not see the way to do it.
I have to mention, that I'm not a top-programmer, and I'm sure, that there is somone out there, who already has done this.
Thanks in advance for help
Hannes Wydler

Answer 1

Hi Abduelkerim
Thanks for replaying
As far as I see, the forum discussion you mention, talks about measure PWM (Digital IN).
I found an other forum input (how to pwm out on NI-9477):
http://forums.ni.com/t5/Digital-I-O/how-to-pwm-out-on-NI-9477/td-p/624448
There Application engineer Samantha says, the NI9477 is not a "corelated" digital module and therefor it cannot link to the backplane counter of the cDaq. Others DO-modules could do that (like 9401).
But what we need is the high power of the 9477 (1 Amp per channel - I would connect 3 outputs together for my need of 2.5 Amps).
I don't find in the specifications of the different DO-modules if they are "corelated" modules.
It seems, it's not possible what I want to do - a simple direct mode with the cDAQ to supply and regulate peltier elements.
Hannes