Proximity switches or limit switches

[JAZZCNC]

Thanks Jazz. Have just had a NPN normally closed proximity switch delivered from Amazon. Im guessing then that with this device I would set the input for it to active high?

No that would be Active Low.
Because the type is N/C Mach sees the signal all the time(High) and when signal disappears (low) the pin goes active. So it's (Active Low)
If it was N/O type it would be the reverse. The pin is low and goes Active when the signal is High. (Active high)

Word of caution with the IP/M and it's inputs. They are Non-isolated which means the don't tolerate being miss wired so before you go connecting anything up to them be sure you fully understand what your doing, they don't take prisoners.!