Sensor connection

wolves-32 · Apr 16, 2013

I am trying to connect a diffuse reflection sensor to Automation direct PLC ( Click basic ) the sensor has three wires ( brown L+, blue L-, Black Load) also it is PNP ( sourcing ).

My question is how to connect the sensor to the PLC's inputs .

jstolaruk · Apr 16, 2013

Black goes to the PLC input, blue goes to 0V DC common (the PLC input's common will also need to), and the brown connects to +24Vdc.

Lancie1 · Apr 17, 2013

Wire it as your CLICK C0-USER-M User Manual wiring diagram shows in Chapter 3, Page 3-27. Because your sensor is a Sourcing device, then your PLC input must be wired "opposite" as a Sinking input. The CLICK inputs have double diodes so they can be wired for either polarity.

Wiring for Sourcing Device to CLICK Sinking Input.png

wolves-32 · Apr 17, 2013

I connected the sensor black wire to the PLC's input and the blue wire to C1 (common) and the brown to 24V but the sensor is not working. I did try to connect the sensor to the power supply output 24V and 0v and it worked. I know that I need to connect the black to x1 and the blue C1 but why the sensor is not working when I do that ?

Tharon · Apr 17, 2013

Take a look at the manual for your click inputs. Your sensor needs to be wired to your power supply, but your inputs need to be appropriately wired to the same power supply as well. That C1 will need to be connected to the 0V of the power supply if you want the input to turn on when 24V is applied to the X1 terminal.

wolves-32 · Apr 17, 2013

Thanks guys for your Help

I am new in PLCs and I am trying to learn it

Mark Snodgrass · Apr 17, 2013

Remember, PLC inputs are current sensing, not voltage sensing. If you do not have a complete loop for the current to flow, the input will not turn on.

Tharon · Apr 17, 2013

Well, that's not entirely true, but we'll not muddy the waters and confuse people. Let's just say refer to the manual for wiring recommendations and min/max voltage requirements for the inputs.

arkyny · Apr 21, 2013

Also, be sure to wire the commons on the input card from your 24v power supply.

Sensor connection

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