analog feedback from two analog inputs

[wayne g]

Is there a way via MAX or Labview software where I can feed two analog signals into a motion control card and have these signals control one motor.  I would like to be able to sum the analog signals and have the motor drive accordingly, controlling the PID etc.

I know there is the ability to switch and thereby route the analog feedbacks to any of the motion axis, but do not know if there is a way to perform a simple mathematical function on two signals and then feed this into one analog input

wayne

[Jochen]

With standard NI motion controllers it's not possible to do mathematical calculations with the feedback signals before feeding them to the PID loop. I can think of two solutions:

1. Add a summing amplifier to the signal path of of your analog feedback signals and connect the output to the analog feedback input of the board.
2. You could build your own motion controller by using the NI SoftMotion Development module. Here is a link to a 10 minute NI-SoftMotion presentation

Maybe solution #2 is a bit oversized for your project but for the case that you need even more degrees of freedom for your application it might be still very interesting.

Best regards,

Jochen Klier
National Instruments Germany