The Industrial Raspberry Pi Forum

Posted: **06 Oct 2020, 07:54**

Hi !
I have a question about the setting and reading the AIO values.
I have a 4-20 Input and Output.

For setting the Output :

Do I need to send values from 0-100 % ? so 0 would be 4 and 100 would be 20, or do I need to send values from 4 to 20 directly?

For receiving Input :

Basically same questions .. do I get the values in percent? or will I get values ranging from 4-20 ?

Would appreciate the help.
Greets
Andre

Posted: **06 Oct 2020, 15:19**

Hi Aandre, Inputs und Outputs are in mV or mA. So for example 10V equals 10000 in the process image.

Posted: **06 Oct 2020, 17:12**

I think that should be uA and mV.

Posted: **09 Oct 2020, 09:38**

Hi RR4711 you are right. Have a look here How to Configure Analog Input:

The scaling can be used for the conversion into other units or for a subsequent calibration of a sensor. When calculating in an AIO Modul, a 32-bit Integer Arithmetic is used. The results are then stored again as 16-bit values in the process image. Should the result Y exceed the limits of a 16-bit signed value, then the error is recognised and the value limited. The initial values always lie in the unit mV or µA respectively.

The Industrial Raspberry Pi Forum

Reading and writing AIO

Reading and writing AIO

Re: Reading and writing AIO

Re: Reading and writing AIO

Re: Reading and writing AIO