Originally Posted by
HimyKabibble
They are not "contacts", they are open-collector outputs. You can wire them all to the same BOB input, with a pull-up resistor, and the input will be normally high, and will go low when you reach a limit. This requires that each switch comes close to some ferrous metal at the limit, and not at any other time. If you use normally close switches, and wire them all to a single input, then you have to ensure each switch is close to ferrous metal all the time, EXCEPT when at a limit. Prox switches cannot be wired in series like mechanical switches, and since they are about equally likely to fail in either state, there really is no benefit to either method - it's more which is physically easier to implement on your machine. They will be FAR reliable long-term than mechanical switches in any case. Wiring failures should not be a significant concern if the wiring is done correctly.
Regards,
Ray L.