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I understand a little bit better.

Thank you both for the information

OK, but do you need the resistor on the +ve (Brown) lead for each sensors to drop the Voltage ??? Or can I put it as I indicated on my diagram ?? Or do I need any at all ??
Then my diagram is a is...

Need some advice about wiring the Gecko G540 REV8 and Proximity Switch Sensor NPN NO.

The thing is I'm a little confused on the wiring, some people say to hook it up to the ground, but I thought...