Hi,
Usually the Limit Switches that I've seen on CNCs will have four contact pins, two are for the NC, and two more are for the NO, I would disassembly the limit and take a look at that., re-wire it to NC and re-route then to the Konnect. If you are not sure, you may upload a picture of said limit.
Also, yes, if you are using NO switches there is no way to know if one of them is not properly working; Until you crash your machine when the limit switch fails to stop it.
Hope this helps.
Regards,