Adapter for limit switch and input switch connection of Mk3 controllerp

https://planet-cnc.com/product/limit-input-board/

Some Manual? PNP, NPN or both possible?

This board is for mechanical switches or PNP inductive switches.
It is basically a multichannel version of this:
http://planet-cnc.com/wp-content/upl...16/02/Opto.pdf