Large PLC – Open Source Hardware

The large brick-type open source PLC has 22 digital inputs, 6 analog inputs and 16 transistor outputs. It also features a SD card socket, 2 RS-232 ports, 1 RS-485 port, 1 USB device port and a JTAG port for programming and debugging.

Large Open Source PLC

Large Open Source PLC

All the source files including circuit diagrams for building the large open source PLC are available for download at the above link.

Small PLC – Open Source Hardware Project

This small brick-type PLC open source hardware project is based on an ARM7 microcontroller from Atmel. The PLC has 10 digital inputs, 8 digital outputs, 4 analog inputs, a real time clock, RS232 port, RS485 port, USB port and JTAG port.

More information and circuit diagrams are available at the above link.

Small Open Source PLC

Small Open Source PLC