A Modular PLC system will have some size & cost, and as a home central should be small, easy to hide and low cost it might be wise to produce a specialized “All In One” solution. The diagram above illustrate the content with “backbone” replaced by a MCU. The C firmware will basically only be a simplified version of what we use on the modular system. The content focus on communication only since we expect distributed nodes communicating through RS-X to perform the sensor/actuator parts.