What is Ladder Logic?
Ladder Logic (LD) is a visual, rung-based programming language used to program PLCs (Programmable Logic Controllers). It was designed to resemble the relay wiring diagrams that electricians used before software-controlled automation.
Rungs and Power Flow
A Ladder Logic program is a stack of horizontal rungs drawn between two vertical power rails. Each rung represents one logical condition-and-action pair.
Branches and OR Logic
A branch is a parallel path on a rung. Power flows through the rung if any one of the parallel paths is true. Branches are how Ladder Logic expresses OR.
Instructions
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