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A low-pass filter is used to smooth a signal by allowing slow (low frequency) changes through, while filtering out fast noise or spikes and keeping real trends. On output what you get is a stable value that can be used for control decisions. Typical applications are: Temperature sensors Analog inputs Flow or pressure signals PID feedback stabilizations Any noisy measurement in industrial environments In Process Simulate this kind of filter can be implemented with a sim

Expressions can be found everywhere in your code. They are used to express conditions, formulas, constants etc. Expression evaluation is one of the most important things when it comes to implementing a programming language. Effective expression evaluation improves performance while it guarantees the correctness and the consistency of the results. Now how do you achieve that? It depends on the type of the interpreter you are building. With an AST interpreter, like the one we

VARIANT is yet another data type that you can use in your functions / function blocks. Usually it comes in handy when defining the...

We all know that values are assigned to variables using the assign (:=) operator. But do you know that the assign operator may be used...

How do we check if the position of a 3D point is above or below a given 3D plane? This is a classic math problem and it has a well known...

A noise generator by definition produces a random signal. In the software world this usually means generating pseudo-random numbers. One...

Expressions are language entities just like statements. The main difference is that expressions should be evaluated in order to calculate...