Scaling Ratiometric potentiometer

Hi,

I am trying to scale a ratiometric potentiometer for use in a logo program. This potentiometer puts out 0.5Vdc for 0 degrees and 4.5Vdc for 120 degrees. I used the program from this topic: https://support.industry.siemens.com/tf/WW/en/posts/analog-input-scaling-0-5v-to-4-5v/199646?page=0&pageSize=10

This program actually does not work for my application. The logo shows a range from 0.02Vdc to 1.95Vdc while I am rotating the potmeter from min. to max. range. But my voltagemeter shows 0.5Vdc to 4.5Vdc on the analog input (I7 on the 12/24RCE logo). I have no idea where the to find the problem. In the simulation from Logo the program works as it's supposed to. Any idea what I am doing wrong?

Still having the same problem

0.5Vdc on the multimeter gives 0.1Vdc on logo

4.5Vdc on the multimeter gives 1,93Vdc on logo

I think you may need to play with analog amplifier function.

...sent from App

ixo65

I do not know your potentiometer and I do not know how you connected it.
Just as little can I judge if you measure the voltage at the right points.

Sketch your connection diagram of the potentiometer to the LOGO! and mark the points where you measure the voltage.

I can only tell you that my scaling in the LOGO! program is correct based on the parameters you have specified.

 Thanks for your answer, your scaling program is indeed correct. 

In the attachment the diagram how the logo is wired with the potentiometer. The potentiometer is a Novotechnik RSC3200