npn -relay- pmdx-122 wiring diagram
 

After much thinking, ... I was unable to resolve this
http://img835.imageshack.us/img835/7816/npnsensor.jpg

how to connect this?

I hope that there is someone who has the time to help me

tx

See if this helps you.

There is some additional stuff that you don't need.

first like to thank you found time for me and your explanation
http://img849.imageshack.us/img849/7816/npnsensor.jpg



means,

I have to have a power supply of 12 V DC!?

which is most commonly used?

Or 5v or 24v or other.
Personally, I ordered a power supply from Antek with:
56V tap for steppers
12V tap for prox circuit
5v tap for laser, led's

I have a toroid trans output of about 30V and 9V/1A

can I use the 9v for pmdx-122 and prox?

Most Prox are 12v/24v but to vary. For instance, you can order a version that is 10vdc-30vdc allowable. 9v might be low for the sensor to activate and sense properly.

hmm,
Then, without complicating remains (repeatedly presented)

DC Switching Power Supply,
Slim-line,
DIN-rail mount,
Plastic Case,
12V/4.2A Output,
85-264VAC Input

Do you agree?

4.2A (50VA)is too big... you can save easily 50% if you go for a 2A SMPS which is still too much capacity for just 3 proxy switches. If I remember off the back of my head, each swith is 200mA & a3x200ma=0.6A double safty factor (which is already way too much for such application) is 1.2A & triple the safety factor is 1.8A... Why don't you save the difference in price to get a 6-pack? :)

..on this data I'm not careful

thanks Ken