LibrePLC32 is an open-source Programmable Logic Controller (PLC) hardware project.

The goal of the project is to create a compact, hackable, and well-documented PLC platform for industrial automation experiments, prototyping, education, and open hardware development.

LibrePLC32 aims to provide:

• An open hardware PLC design
• KiCad source files for schematic and PCB development
• Field-oriented interfaces such as digital I/O, CAN, RS-485, and Ethernet
• A design that can be studied, modified, repaired, and improved by the community
• Documentation for design decisions and component calculations

The project has the following features:

• 8–36 V DC input voltage range
• 4 isolated digital inputs for field signals
• 4 transistor digital outputs for driving external loads
• 2 relay output terminals for switching isolated loads
• RS-485 interface for industrial serial communication
• CAN bus interface for device-to-device communication
• Ethernet interface for network connectivity