How do I program my PLC with CoDeSys V2.3?

Mick90ByMick90

Hello everyone, I'm slowly starting to understand my PLC better. It uses the CanOpen protocol.

I would like to write a small program that evaluates a 10-bit analog input and uses it to create a small display in the visualization.

I already have a visualization. I have a multimeter parallel to the analog input to check the voltage. Here is the declaration and the ONE 🙁 line code:

PROGRAM PLC_PRG

VAR

AnalogInputValue AT %IW2 : INT; (* %IW2 saved *)

Voltage : REAL; (*Voltage in volts *)

END_VAR

Voltage := (AnalogInputValue / 10478)*11;

Without started simulation

With the simulation started and a specified value of 150.

Thank you

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EchoTech
EchoTech
10 months ago
PROGRAM PLC_PRG

VAR
  AnalogInputValue AT %IW2 : INT; (* Analogeingang *)
  Voltage : REAL;         (* Berechnete Spannung in Volt *)
END_VAR

these are your declared variables that look fine

Your program code isn’t true…

How do you get to 10478?

The constant 10478 has nothing to do with a 10 bit value -> (0-1023) is the constant

so.

Voltage := (AnalogInputValue / 1023.0) * 11.0;
1
Mick90
Author
Mick90
10 months ago
Reply to  EchoTech

Even if the bill was wrong, something would have to be seen in VISU. ?

0
EchoTech
EchoTech
10 months ago
Reply to  Mick90

if you don’t get there I can explain how you do

1
EchoTech
EchoTech
10 months ago
Reply to  Mick90

usually already…

Check your variables – (links), so whether the variable voltage is linked to the text field in the visualization and whether voltage is correctly configured in the visualization editor.

If so send the analog input value AnalogInputValue to the debugger and see what it outputs

1
EchoTech
EchoTech
10 months ago

please

1
Mick90
Author
Mick90
10 months ago

I got it. Since I used a REAL as a variable, I missed the ‘ .0’ behind the 10 bit value. Thanks for your tip!

0