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Ladder logic rung showing an XIC contact in series with an XIO contact driving an output coil
ladder logicXIOXIC

XIO vs XIC: Understanding Examine Instructions in Ladder Logic

XIC and XIO are the two examine instructions every PLC program is built on. This guide explains what each one tests, how they map to physical wiring, and shows the logic live with an interactive contact you can toggle.

7 min read