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one-shot

2 articles tagged “one-shot”.

Flat vector diagram showing a PLC input signal falling edge triggering a single OSF one-shot output pulse in ladder logic
one-shotedge detectionladder logic

Falling-Edge One-Shot in Ladder Logic: OSF Explained

The OSF instruction fires a single scan pulse on a signal's falling edge. Learn exactly how it differs from OSR, where it saves you from logic bugs, and see a real worked example.

Jul 31, 2026 · 8 min read

PLC ladder logic rung showing an OSR one-shot rising instruction converting a sustained input signal into a single-scan output pulse
ladder logicone-shotedge detection

One-Shot Rising Edge in Ladder Logic: OSR Explained

Learn how the OSR (one-shot rising) instruction works in PLC ladder logic, when to use it, and how to avoid the single-scan pitfall that catches every newcomer.

Jul 31, 2026 · 8 min read

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