limit switchs will not turn off

[AaronParness]

We are using PXI 1031 with NI Motion Assistant and the Measurement and Automation Explorer. Our limit switchs are always reading active, and when we go into Axis Configuration to try and change thigns, something is creating an update loop that prevents us from changing any of the default confiurations. Any suggestions on either the update problem or the limit switch issues? Probing the limit switches shows good performance 0V-4.8V off/on, so it is not the hardware.

Thanks,

Aaron

[Andy_C.]

What is the motion controller that you are using?

We can try to go into Measurement and Automation Explorer, expand your particular motion device, go to Motion I/O Settings and disable all limit swithces and initialize to see if the limit switch will be turned off.

[AaronParness · Accepted solution]

Was able to solve this problem by decreasing the pull up resistor size (from 1K to 300) on the limit switches themselves. Apparently, the motion controller (NI UMI-7774) requires a certain amount of current to power the limit switch LEDs and register the switches as active. Thanks, anyways.

Best,

Aaron