SimplePLC is a lightweight, software-based PLC designed for educational use, simulations, and small-scale automation projects.

• Modbus TCP & OPC UA servers
• Lua scripting for control logic
• 100ms cyclic execution with hot-reload
• Cross-platform (Linux, macOS, Windows)

mkdir build && cd build
cmake ..
make

Linux

sudo apt install libmodbus lua open62541

macOS

brew install libmodbus lua open62541

Ensure the following files are in the same folder (examples in scripts folder):

• settings.ini
• active.plc (optional) world.plc

Then run:

./SimplePLC

Build it yourself or get pre-built binaries from GitHub Releases.

• open62541.org
• libmodbus.org