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I am trying to install a photo eye to use for a lay down bottle sensor.

I wired in the power, it turns on the light on the sensor flags when triggered.

But I’m not abel to trace where the signal is happening on the wiring. It’s a 4 pin and below is the schematic . Someone told me they had to use a relay to get it working something about separate power. But the photo eye should be self contained. So I don’t know why they needed to add extra stuff to get it to work.

Below is the schematic it comes with. Any help in understanding would be greatly appreciated. I can get it to work with the relay. Like the other person suggested I’m just not sure why.

Thank you

enter image description here

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  • \$\begingroup\$ the output is load, pin 2 ... it tells you right by your finger \$\endgroup\$ – jsotola Dec 22 '20 at 1:49
  • \$\begingroup\$ If i connect pin 2 the black wire to the plc I do not get a signal. Which is why I am here. This is not so black and white. Its 24v system. \$\endgroup\$ – Shalomiehomie Dec 22 '20 at 1:53
  • \$\begingroup\$ why is that information missing from the question? \$\endgroup\$ – jsotola Dec 22 '20 at 1:55
  • \$\begingroup\$ seems pretty straight forward ... the output is Open Collector ... wire it same as a mechanical switch \$\endgroup\$ – jsotola Dec 22 '20 at 1:56
  • \$\begingroup\$ I was able to figure it out and updated my question \$\endgroup\$ – Shalomiehomie Dec 23 '20 at 19:48
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So I figured it out. It did not work because the signal wire outputs 3vdc and the plc input is 24 source. So I had to set it to pnp and use black as my signal wire. Because this way the kid completed the circuit. I could not use white wire on npn because it was on the low side of the circuit

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  • \$\begingroup\$ Tip: when posting a question please post the link to the datasheet so we can get context and missing details. \$\endgroup\$ – Transistor Dec 23 '20 at 21:15

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