Hello Aragorn,
If you use the Read per Axis Status.vi (in the FlexMotion >> Trajectory palette), it will let you know if Limit Switch is active or not.
The Read Limit Status.vi (FlexMotion >> Motion I/O palette) will return the status of the limit switches (active or not active).
The reason the term active or not active is used instead of On or Off is the polarity of the Limit Switch (active high or active low) is not accounted for with the terms On and Off.