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plc scan cycle

1 article tagged “plc scan cycle”.

Flat vector infographic of the PLC scan cycle showing four phases arranged in a circle: input scan, program execution, output scan, and housekeeping with connecting arrows
plc scan cycleplc basicsladder logic

How the PLC Scan Cycle Works: Step by Step

The PLC scan cycle is the heartbeat of every control system. Learn exactly what happens during input scan, program execution, and output scan, with real numbers and field gotchas.

Jul 29, 2026 · 10 min read

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