Python & Programmable Logic Controllers - A Step by Step Guide
summary
A small AutomationDirect P1-540 PLC runs ladder logic that blinks a three‑color traffic light; two variables blink interval millisecond and blink color are exposed as modbus registers (holding registers 0 and 1). A laptop at 192.168.1.8 talks Ethernet to 192.168.1.9 using pi-modbus-tcp (pip install) to read value 1 (red), write 2 (yellow) and change 1000ms → 500ms → 2000ms; the demo works end‑to‑end.
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chapters (8)
- 0:00Introduction to PLC
- 1:07How PLC works
- 4:32Speaker introduction
- 7:58PLC setup tutorial
- 13:28Modbus protocol basics
- 17:49Python interaction demo
- 21:55Programming and limits
- 26:13Q&A and conclusion
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