Pressure Function Block Implementation

The Pressure sensor utilized is from Gens and has the following parts number: 3500B350MG05G000 

The code for the pressure sensor is based off its techincal data, where the minum current of 4mA equals a pressure of 0bar and the maximum current of 20mA equals a pressure of 350mbar.

Linear interpolation is performed with the following function (Chapra and Canale, 2015),

This means that the inputs needs to be,

• sensor_reading:REAL;
• max_bar:REAL;
• max_bar_in_mAmps:REAL;
• min_bar:REAL;
• min_bar_in_mAmps:REAL;

And the outputs needs to be,

• bar_read:REAL;
  
  

This Function block could have been a Function. However, to make it easy to expand on the function block in the future, it was created as a Function Block.

The coded implementation looks like this,

Visually the new function block looks as following,

References:

Chapra, S.C. and Canale, R.P. (2015). Numerical Methods for Engineers. 7th ed. New York: McGraw-Hill Education. [pdf] Available at: https://gdcboysang.ac.in/About/Droid/uploads/Numerical%20Methods.pdf (Accessed: 28 May 2024).