Which statement best describes Ladder Logic?

Which statement best describes Ladder Logic?

• A. It is a graphical programming language similar to relay logic diagrams
• B. It uses only numeric computations
• C. It relies on high-level programming constructs
• D. It simplifies programming by representing circuits as relay logic diagrams

Answer: (D)

Ladder Logic is a graphical programming method used in PLCs that mirrors how electrical relay control circuits are drawn. Imagine a ladder with two vertical rails and horizontal rungs; each rung shows inputs as contacts and an output as a coil. When the conditions on a rung are met, the coil energizes, implementing simple on/off logic. This layout lets you wire logic the same way you would a relay circuit, which is why it’s described as simplifying programming by representing circuits as relay logic diagrams. It’s a visual, boolean logic tool, not focused on numeric calculations or high‑level programming constructs.

Ladder Logic is a graphical programming method used in PLCs that mirrors how electrical relay control circuits are drawn. Imagine a ladder with two vertical rails and horizontal rungs; each rung shows inputs as contacts and an output as a coil. When the conditions on a rung are met, the coil energizes, implementing simple on/off logic. This layout lets you wire logic the same way you would a relay circuit, which is why it’s described as simplifying programming by representing circuits as relay logic diagrams. It’s a visual, boolean logic tool, not focused on numeric calculations or high‑level programming constructs.