This article uses Berghof’s B-Nimis MC-Pi Plus Controller with the LIN_TRAFO Function Block from Codesys’ Util library to perform linear conversion of analogue signals. The analog signal is converted linearly.
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Util.LIN_TRAFO
With Util.LIN_TRAFO, a linear transformation can be performed. The transformation also results in a linear approximation of the output value using the minimum and maximum values of the input.
For example, temperature sensors provide input values, which are converted into temperature values in degrees Celsius (output OUT). The range of its input values is defined by IN_MIN=0 and IN_MAX=10. The range of output (Celsius) values is defined by OUT_MIN=20 and OUT_MAX=40. Thus, for a 5 V input, the temperature in degrees Celsius converts to 10 degrees Celsius.
VAR_INPUT
| IN | REAL | logical input value |
| IN_MIN | REAL | Minimum input value |
| IN_MAX | REAL | Maximum input value |
| OUT_MIN | REAL | Minimum output value |
| OUT_MAX | REAL | Maximum output value |
VAR_OUTPUT
| OUT | REAL | output (data) value |
| ERROR | BOOL | TRUE: IN_MIN = IN_MAX or IN is out of input range |
Implementation
Add library
Add the library from the Library Manager.
Click Add Library.
Add the Util library.
Program
We will also use LD2 in this article: add the Block from the Toolbox to Rung1.
Add Util.LIN_TRAFO
An Empty Block like number has been added on the Editor.
Enter Util.LIN_TRAFO at ?.
Done!Util.LIN_TRAFO Block has been added.
Next, on the FB of the Util.LIN_TRAFO, click ?? and select the Util.LIN_TRAFO instance defined in the VAR area.
Done!
Finally, assign all parameters to variables.
Add ST Block
You can also execute ST code directly in the LD2 programme: add the ST Block to the Toolbar to the Rung of Empty.
Done!
Next, click on Empty Rung, which you have just added.
The Text Editor appears, so write your ST code in this area.
Done!
Result
The function Util.LIN_TRAFO could be executed without error, and Out can be Scaled according to the input values of rSensorIN.
The waveforms of the data transformation can also be viewed in Trace.
