Self-host OpenPLC Runtime v4

This project provides a headless industrial PLC runtime that executes IEC 61131-3 programs on ordinary Linux hardware. It splits into a Python Flask REST API server and a C/C++ real-time engine that runs with SCHED_FIFO priority for deterministic scan cycles. The OpenPLC Editor desktop application compiles programs locally, uploads them via HTTPS, and controls execution through the API. A WebSocket interface enables live variable monitoring and forcing. The system supports a plugin architecture for hardware I/O drivers, with both Python and C/C++ plugins running in isolated virtual environments. Prebuilt container images target x86_64, ARM64, and ARM32. Installation options include Docker, Docker Compose, a one-line Linux installer that sets up Docker automatically, or a native source build. Minimum hardware is a 1 GHz CPU, 512 MB RAM, and 500 MB disk. The codebase is MIT-licensed and maintained by Autonomy Logic.