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Originally Posted by sparksandtabs
I have the 4 wire one, please describe it better if possible, I got confused
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OK
With the four wires you should have a brown one, a blue one, a black one, and a white one.
The brown one is your positive voltage.
+5V dc, +12V dc, +24V dc, as an example, depending on what the switch you're using is rated for.
The blue one is 0V.
The black wire is "dark" if it's a photo eye or "part present" if it's a proximity switch.
The white wire is "light" for a photo eye or "no part present" for a prox switch.
(FYI- I work with different Banner, Festo, and SMC switches everyday. I assemble and service robots and other automation systems for the plastic injection molding industry)