Case study of a small hydro plant controlled by two Raspberry PLCs joined by a CAN bus. A Raspberry PLC 21 FLEX in the turbine cabinet handles the start sequence, the inlet valve, the guide vanes and the synchronizer. A Raspberry PLC 42 in the plant cabinet reads the plant signals and links the plant to the remote office over Ethernet. The signals and values on the page are one possible layout.

The PDF covers the challenge, the three stages (start, follow the river, stop safely), the system architecture with the signal list and the hardware used. Interactive version: small hydro plant case study online.