Proximity switches or limit switches

[Neale]

Actually, taking each home switch into separate inputs on the CSMIO isn't a big issue as it has plenty of inputs available. It also means that you can set Mach3 to home more than one axis at a time, which saves a bit of time on a larger machine. I home Z by itself (to get it to highest level above bed) and then X and Y together.

I also use proximity switches for combined home/limits although I have wired upper and lower limits in series on each axis partly to save one input channel but also to reduce wiring through cable chains a little. You have 24V available and proximity switches in series work fine with that. Because they are also limit switches I use NC throughout for the safety reasons mentioned.