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mikeecbr January 11th, 2018 03:48 PM

how to wire analog sensor to PLC
 
Hello everyone,

I'm new to the forum and I've never work with analog sensors before.

How do I wire up 3-wire ultrasonic analog sensor to Allen Bradley PLC?
I don't understand wiring diagrams of the PLC.

PLC - CompactLogix 5370 L2 / pn: 1769-L24ER-QBFC1B
link: http://literature.rockwellautomation...m021_-en-p.pdf
Analog sensor - pn: UK1A-E2-0A
link: https://cdn.automationdirect.com/sta...mmultrauk1.pdf

Webhead January 11th, 2018 04:31 PM

If I'm reading the cutsheet correctly, Brown goes to +24VDC, blue to (-) terminal on plc input and black to (+) terminal on PLC. If that doesn't get you where you want to be let us know.

mikeecbr January 11th, 2018 04:42 PM

1 Attachment(s)
Quote:

Originally Posted by Webhead (Post 764787)
If I'm reading the cutsheet correctly, Brown goes to +24VDC, blue to (-) terminal on plc input and black to (+) terminal on PLC. If that doesn't get you where you want to be let us know.

Hi Webhead,

I don't quiet understand what you mean by (-) terminal on plc input and black to (+) terminal on PLC. I don't know how to wire up whole analog implemented i/o module. Please see attached.

Brandon_K January 11th, 2018 10:02 PM

1 Attachment(s)
Assuming you have no other analog devices connected;

You want to use diagram 3 on the ultrasonic sensor.

Brown +24v from power supply
Blue 0v from power supply
Black "I in 0+" on the PLC

You'll need to also have a short jumper on "I in 0+" and "V in 0+" to bond them. Lastly, you'll need to run a connection from the 0v connected to the blue wire of your sensor to to "V/I in 0-" on your sensor. This is on the bottom of page 184 in the manual you linked to.

Basically blue and brown on your sensor are to power the sensor. Black is your +mA output from the sensor. But it's a 3 wire sensor, so the 0v (blue) does "double duty" both powering the sensor as well as providing a reference to the controller.


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