What is Ladder Logic?
Ladder Logic (LD) is a visual rung-based PLC programming language that mirrors relay wiring diagrams. Learn the basics and run examples in the rungs.dev simulator.
Rungs and Power Flow
Learn how Ladder Logic rungs evaluate power flow between two rails in rungs.dev — series ANDs, parallel ORs, and how outputs are energized scan by scan.
Branches and OR Logic
Use parallel branches in Ladder Logic to express OR conditions in rungs.dev. Series contacts AND together; parallel branches OR — combine them for any boolean rule.
Instructions
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