In the case of ladder logic, logic functions are implemented by developing a ladder diagram. Named for its resemblance to a ladder, the diagram consists of two vertical rails connected by several ...

The ladder diagram shows you what the inputs and outputs are, and it shows how each output responds to a given input change. This is, in fact, what makes a ladder diagram especially useful for ...

I’m finding that ladder logic is still being used in a lot of older plants and is still relevant, although shrinking. I don’t know if it’ll ever go away.