I'm looking for a generic term/process that explains how we can make a closed- loop control system.
The typical elements of a closed loop systems are controller, actuator, plant and sensors.
If you consider a closed loop system with negative feedback loop, it feeds the error to the controller by subtracting the out-put from the desired value.
I'm interested to know how does exactly it happen in real world example?
As far as I know the feedback loop provides an electrical signal, the value that we provide ( the desired value ) is just a string of bits and bytes, so there should be something here right before the controller to do the subtraction operation.
How dose exactly this whole process happen ?
I know engineers design/simulate the whole thing in MATLAB/Simulink or ... . But I don't know the process that turns the simulation into a real ( physical ) final product.