Limit and Home Switch Choice

[JAZZCNC]

Matt I would have separate home and limit switches has often you'll want your home switch inside the limits.

The PMDX is great for limits because like you say it shuts down it's outputs in hardware so it's quite safe compared to lesser normal BOB's that just send a signal to the control software.
Same goes for the E-stop and the Fault option if your drives have them, the PMDX cuts outputs in hardware and at same time sends a signal to Mach so it stops the program.

Ramped limits are fine and work good if you can make them fit.

For the Home switches I would use NPN proximity with the PMDX has you can power them with the on board 12V and it's easy. Thou if your using 24v anyway then PNP will be fine and it can handle them easy enough.

When Mach homes it ignores the limits (Not E-stop) but I'm not sure about the PMDX if sharing switches has I never share switches but my gut feeling is it's doesn't and will just kill the outputs.? Send Steve Stallings at PMDX an email he'll tell you.