Ladder diagram - AbsoluteAstronomy.com

Ladder diagram refers to:

Ladder logic
Ladder logic
Ladder logic is a programming language that represents a program by a graphical diagram based on the circuit diagrams of relay logic hardware. It is primarily used to develop software for programmable logic controllers used in industrial control applications...

, a method of drawing electrical logic schematics. A ladder diagram represents a program in ladder logic.

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