Proximity switches or limit switches

[Kitwn]

The danger with normally open switches is that a bad connection doesn't show up until your machine crashes straight through them. They must be connected in parallel. Wiring faults with normally closed switches will show up immediately. They need to be connected in series.


Kit

[JAZZCNC]

If your taking this route using separate mechanical Limits to homes then Go with NC for the Limits and wire in series using just 1 input like as been suggested.
For the Homes, it doesn't really matter because you can set Mach3 to see trigger when goes low and you will need them on separate inputs for IP/M to see them. My pref is NO for Homes.
Also, note You cannot wire the Home switches in series with the IP/M controller and use 1 input for all the homes like can be done with some Mach setups.

I'm going to guess at your next question regards Proximity which will be NPN or PNP. It doesn't matter is the answer because the IP/M will allow you to use either. NPN tends to be more available than PNP, esp in NC type.

[chillybo]

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? Im going to have a play with it at the weekend. I have wired a couple of steppers and drivers up to the IPM to get them moving and to get familiar with Mach and the hardware. I'l connect the proximity switch up and see how it works. The electrics and the machine haven't come together yet.

[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.!

[chillybo]

Nice one. Thanks for explaining this Jazz

[grantx]

Which one did you get? Im looking to get a few as well.

[JAZZCNC]

Which one did you get? Im looking to get a few as well.

Grant if you need any proximity switches I can supply you with some. Drop me an email if need any.