Limit Switch output IoniCube


I have a question about the Limit Switch output of the IoniCube.

i have a cube setup with 3 pro servo drives in it and it is wired up and functional.

From my understanding the GPO4 or Limit switch output should be high when the limit witch of the axis is pressed. Though measuring directly on the pin does not show any change in voltage or continuity to ground.

i can see that the GPI1 (homing switch input) is being activated and the drive acknowledges that it is homed.It just doesn’t trigger the limit output pin.

Is my understanding wrong or is there a software problem?
(running the latest firmware)

Best Regard
Tobias T. Strate