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In this part of the open source PLC project, we take a look at the components that are used to construct the small brick-type open source PLC.
The hardware source files including schematic diagrams and design files can be downloaded here.
The Small Brick Open Source PLC consists of three circuit boards:
The photo below shows all the components that are used to make the small open source PLC, including the circuit boards, ribbon cables used to connect between the boards and the case used to house the PLC.
The boards were designed using Altium designer. The download below is for the Altium designer source files for all three boards.
If you would just like to look at the schematic diagrams for each board and do not have Altium designer, see the schematic in PDF format for each board below.
All new projects on the Starting Electronics website will be based on the open source KiCad EDA tools for schematics and PCBs.
Download the Altium designer PLC source files: OSPLC1_source_files.zip (1.1MB) – needs the Altium designer software to view.
The Gerber files and drill files for this project are included in the above download.
Two images of the PLC CPU board are shown below. The CPU board is positioned under the status board in the PLC case with a reasonable clearance between the two boards. This puts the CPU board somewhere near the middle of the case.
The connector at the right of the board is for RS-232.
PLC CPU Board Schematic: OSPLC1_CPU.pdf (27.4kB)
Board outline showing dimensions: OSPLC1_CPU_outline.pdf (32.1kB)
Top and bottom views of the PLC Input/Output (I/O) board are shown below. The connector on the right of the board is for RS-485.
PLC I/O Board Schematic: OSPLC1_IO.pdf (41.1kB)
Board outline showing dimensions: OSPLC1_IO_outline.pdf (66.5kB)
The single-sided status board is shown here. The RESET and TST buttons have not been soldered to the board.
PLC Status Board Schematic: OSPLC1_CPU_STATUS.pdf (8.9kB)
Board outline showing dimensions: OSPLC1_CPU_STATUS_outline.pdf (32.9kB)