Drag chain and switch type.

[paulus.v]

Hi Ollie,

The best way to go is using both switches wired in series with the estop and sensors for homing/soft limits. 24V is the industrial standard as it is more resistant to noise/interference/contact oxidation/etc.

You do not need to step down the signal if using NPN sensors and your controller allows you to use NPN.

Having the sensors wired to separate inputs allows you to home all axes simultaneously. No other major benefits.

The safety limit switches need to be wired NC, for the sensors it doesn't matter.

I have no experience with the no-name sensors as I was using only expensive ones. You can use one sensor for each axis if you mount them on the moving part while having two end-targets.

I have used only Igus cable chains. They are not the cheapest but very good industrial quality.