When using the analog inputs and analog outputs of the PCI-7344, what is the conversion between the voltage entering the card to counts? Similarly, what is the conversion between counts to voltage at the output of the card?

[Carole]

I am using the PCI-7344 to control my system. The analog inputs are connected to the output of my system while the analog outputs serve as feedback to the system. The system is a servo. I want to know what is the conversion between the voltage read at the input, to card counts, and finally to the voltage output to the system.

[Bates]

Carole,

If you are trying to do analog feedback with a servo motor, Chapter 14 of the manual talks about how to set up the torque feedback. 

Chapter 14
NI-Motion User Manual



A. Talley
National Instruments

[algames]

The 7344 has a 12 bit ADC per axis to use as analog feedback. This ADC can take +/-10 volts but can also be configured for 0-5, +/- 5, and 0-10 volts. Depending on the range the ADC is configured for, the value reported as position will be the binary digitized value for the analog signal (e.g. for a +/-10 volt range 20v/(2^12) = 0.0048828125 volts per count.)