Im new to wiring up PLCs. 

Have been looking around and finding some wire diagrams, but i wanna double check here first so i dont mess up the new LOGO i bought.

I have bought this sensor 

https://www.finglai.com/products/sensors/capacitive-proximity-sensors/LJC18A3-B/LJC18A3-B-Z_BX.html

What unclear is how to connect the wires to the logo when using a NPN sensor with 3 wires.

One plan was to connect the black to my input, and then blue to the M (minus)  of the PLC, and then brown to the 24+ (L+) and also to the GND (FE) of the PLC. Is that somewhat correct?

Im also using siemens 230/24V powersupply to get 24v to the PLC, so its connected with 3 wire 230VAC into the power supply. I took the GND (PE) of the 230VAC power cord and connected it into the FE GND of the PLC, hope thats ok. I could have gone and used regular non grounded 230VAC cable, but i felt more safe using extra gnd wire from 230 socket into the PLC

I need to get some directions prior to turning on the power how this sensor should be wired up =)

I noticed, i had to paste it manually. Not sure why into new tab

https://www.finglai.com/products/sensors/capacitive-proximity-sensors/LJC18A3-B/LJC18A3-B-Z_BX.html

Okey, i thought it was more complicated due to its NPN. 

See picure attached.. "The common point of the PLC (M or FE?) and the brown wire is connected to 24VDC supply"

This sentence got me thinking.. But u are saying its ok to just wire it up like normal?

I read somewhere that a resistors sometimes is needed when wiring up NPN...

Can i use the power supplys output to power up my sensors? 

Or do i need a seperate power supply to the sensors?

May be that the NPN type of this sensor doesn't work with the Logo, you normally need a PNP type e.g. LJC18A3-B-Z/BY.

Depending on the internal output driver of the sensor it may be possible to use a pullup resistor e.g. 4.7kOhm to DC24V, then you also can use it with the Logo. But the best way is to use a PNP type without any additional components. The wire colors are normed, brown=DC24V, blue=0V, black=output for NO contacts, white=output for NC contacts.

If you find detailled operation instructions of your sensor, it can be checked, wether you can use NPN with pullup resistor or only PNP.

Regards, Scorp

Just have seen your picture. Try it out with a pullup resistor between 1kOhm and 10kOhm. The resistor has to be connected like the shown load of your picture NPN. Additional the pin 4 has to be connected with your desired Logo input.

ah, that is what i was afraid of.

But u meant wire up a 4.7k ohm res on brown wire to 24VDC?

Here are the specs, any help?

Thanks.

No wonder the confusion..

This drawing is saying.. connect e 2.2k resistor from the black wire to my input to 24VDC...