Unable to read velocity when set to Stepper mode for motor Axis

[Hayden]

Hi all,

I am currently using PXI-7350 controller and required the readings of position and velocity. 

In the Measurement & Automation Explorer (MAX), when I set the configuration of axis 1 from 'servo' to 'stepper', I'm not able to read the velocity data.

Is there anything to do with the setting in MAX to solve this?

Thanks

Jun Wong

[Hayden]

Hi,

I found the solutions here. To read the velocity in the stepper mode, you must first set the stepper setting from 'open loop' to 'close loop'. 

This is due to in open loop, no data will feedback to the controller. Thus, you will not read the velocity data even you use read velocity.vi in NI-motion module.

The settings is located at the right hand site, as can be seen from the figure below.

Thanks