M221 & SoMachine Basic - ANALOG INPUT SCALING

[horvatmiha 0]

Hello!
I am new at PLC programming. I am using TM221CE16R PLC with TM3AI8 analog input module and SoMachine Basic v1.6. I am trying to scale analog input value. I am using 4-20 mA pressure sensor. I managed my wiring so that I get raw values in SoMachine Basic. But I don't know how to scale these values to usable values. My sensor works in range 0 - 16 bar. What is best way to get values? Is it PID function block or multioperand function block using equations to get range 0 - 16?

I will appreciate your help.

 

Thanks in advance!

[NevergoldMel 6]

PID has nothing to do with scaling.

[Wasan 34]

For scaling in M221 you need to follow by scale equations as this link below.

https://stackoverflow.com/questions/5294955/how-to-scale-down-a-range-of-numbers-with-a-known-min-and-max-value

Then I have create program example to scaling input. Please check it.

M221_Analog_IP_Scale.smbp

[horvatmiha 0]

Thanks a lot for your replies. @Wasan, scale equations work great, also your program example is perfect. It's all clear to me. Thanks!