Connecting sensor to AIO

[Nilsi123]

Hi,

I am trying to connect this sensor to the AIO:
https://www.lem.com/sites/default/files ... -p_sp1.pdf

I do have connection and power to the core + AIO, and have them on my PiCtory.
I am not sure on which inputs on the AIO to use, nor which input range to set under the "Value Editor".

Any help please? Thanks!

[Eduard]

Hello,
please connect the sensor to the IN 1 interface. Connect the red cable to 24 V and the black cable to 0 V. The yellow cable of the sensor must be connected to pin 28 of the AIO and the green cable to pin 24 of the AIO. As this is a current measurement you have to connect pin 26 to pin 24 of the AIO.
In piCtory you have to enter the following values.

AIO_4mA_20mA.png (4.23 KiB) Viewed 5861 times

Now you have to save the configuration "Save as Start-Config." and "Reset Driver". Now you can query the measured value of the sensor with “piTest -r InputValue_1”.

Best regards
Eduard

[Eduard]

Hello Nilsi123,
were you able to get the sensor to work or are there still problems?

[Nilsi123]

Hi,

Yes, but i changed the settings to 0-10V insted of 4-20mA.
InputMultiplayer: 1
InputDivisor: 1
InputOffset: 0

With the 4-20mA the AIO blinks red on the "IN", even when i dont have a sensor connected.
So now I am reading values in the piTest where 988 Dec = 0mA and 1432 Dec = 500mA. So this is great! Thanks for the help. If you do have an answer on why the "IN" is blinking red that would be super.

[Eduard]

The meaning of the LEDs is explained here „Range error “A too high a voltage or too high a power supply at one or more inputs”.
What I don't understand, according to the data sheet of the sensor, the sensor delivers a current from 4mA to 20mA and no voltage.

[Nilsi123]

It worked better with 4-20mA, then it does show in mA when meassuring. It still blinks red but so what? It works!

[Eduard]

The sensor probably delivers values less than 4mA or values greater than 20mA, therefore the IN LED flashes.