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interlocks

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Flat vector infographic showing four ladder logic interlock rung patterns for PLC programming, including permissive, mutual exclusion, run confirm and safety guard circuits
ladder logicinterlocksplc programming

Ladder Logic Interlocks: How They Work and Why

Ladder logic interlocks stop dangerous or invalid machine states before they happen. Learn the four core interlock patterns, see real rung examples, and avoid the wiring gotchas that bite engineers on commissioning day.

Jul 31, 2026 · 8 min read

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