Which Type of Limit Switch

[EddyCurrent]

This is the drawing. You will have to make sure the 0v terminals of both power supplies are connected together otherwise it will not work. Where it shows a 24v dc PSU you could use a 12V dc PSU instead if desired.
Colours of the proximity switch wires are for the ones I used but I think they are pretty standard.
Because these are home switches I was not overly concerned about N/O, N/C, so for example mine are 'off' and 'open' until they are activated whereupon they are 'on' and 'closed'. If you get yours wired up and they operate the wrong way you thought they would you can just 'invert' their operation in the software.