Wire a PLC from scratch and write your first complete program — a motor with a 5-second start-warning horn, built rung by rung and traced scan by scan. No experience assumed: this lesson continues from our schematic-reading and ladder-logic lessons.
⏱️ CHAPTERS 0:00 A bare PLC on the bench 0:34 The hardware tour + power wiring 1:17 Wiring the inputs 2:13 Wiring the outputs (the beginner mistake) 3:01 Rung one: the internal RUN bit 3:56 The TON timer + horn and motor rungs 5:41 Running it, scan by scan 7:04 Download, run, and troubleshoot 8:13 Recap + your practice question
📐 IN THIS VIDEO • Wiring inputs as loops: start, stop, overload, and the common terminal • Why outputs drive the starter coil — never the motor itself • Internal bits, and the on-delay timer (preset, accumulator, done bit) • A start-warning horn: the industrial pattern that protects people • The lights → logic → wiring troubleshooting order
✅ VERIFICATION Wiring conventions and TON timer behaviour verified against published industrial-controls references. The complete four-rung program in this video was run in a scan-cycle simulator before publication — including the stop-and-restart timing question at the end.
Educational content. Electrical work must be performed or supervised by qualified personnel in accordance with local codes. AI-assisted production; human-verified technical content.
