Proximity switches or limit switches

[JAZZCNC]

If your taking this route using separate mechanical Limits to homes then Go with NC for the Limits and wire in series using just 1 input like as been suggested.
For the Homes, it doesn't really matter because you can set Mach3 to see trigger when goes low and you will need them on separate inputs for IP/M to see them. My pref is NO for Homes.
Also, note You cannot wire the Home switches in series with the IP/M controller and use 1 input for all the homes like can be done with some Mach setups.

I'm going to guess at your next question regards Proximity which will be NPN or PNP. It doesn't matter is the answer because the IP/M will allow you to use either. NPN tends to be more available than PNP, esp in NC type.