Hi
There are different AT-MIO-16Dx-xx boards, but with NI-DAQ 6.6 only the AT-MIO-16DE-10 is supported. You can see which board is supported with your NI-DAQ version if you look into the "NI-DAQ user manual for PC compatibles" of your Version. You can download it from "ni.com".
Regards,
Luca