Regarding cascade, feedforward, and feedback
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As the title suggests, these three control theories are often used in control systems. So, in what situations are these control principles applied, and how are they represented on P&IDs? It’s mentioned in the textbook, but it remains quite abstract; it would be great to have some examples
Take a look at textbooks on control engineering; they explain things in detail and include examples.
This issue cannot be explained in just a few words; it’s best to read the material and understand it gradually. If there are parts that are unclear, it’s better to ask questions about them. The topics of these questions should not be too general – specific details are needed in order to get proper answers.