01What it gives you
A web-based editor, the five IEC 61131-3 languages, a runtime that maps to the Pi's I/O (or industrial I/O boards), and built-in Modbus so it talks to existing gear out of the box. It's the closest thing to a free PLC you can flash to a Pi this afternoon.
02Where it stops
OpenPLC isn't certified and isn't deterministic on stock Linux. For non-safety monitoring and control that's fine; for hard real-time or SIL functions, pair it with an MCU or keep those on certified hardware.
Common questions
The ones we're asked on every first call.
For non-safety, non-hard-real-time control, yes — it's used in real deployments. Treat it like any soft PLC: great for supervision and logic, paired with certified gear or an MCU where determinism or safety is required.
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