The EWIO2 is a compact Ethernet I/O controller based on Linux, which connects digital and analouge signals from the sensor and actuator level with an IP network. Simple tasks in building and industrial automation can be implemented with functions integrated onto the webserver. Immediately executable applications can also be created via the web interface in a displayed Linux Shell. Two Ethernet-Ports with a Daisy Chain function are available for the connection to the LAN network. The system is parameterised, configured and commissioned through a platform-independent web browser. For the upgrade of the sensor/actuator level, MR-I/O upgrade modules can be connected using plug & play jumper plugs and wiring to a second interface of EWIO2, Modbus RTU devices. An integrated µSD memory card expands the range of functions of the EWIO2 for save settings, data and applications.