Powerful data logger for tasks in energy controlling. Meter data, temperatures etc. can be recorded via the intergrated I/Os, the M-Bus and RS485, and switching and actuating signals can be generated. An integrated data base supplies the data for higher-level energy management systems via LAN. Also, a connection via WLAN is possible. An integrated web server allows the configuration and parameterization via a web browser. Applications immediately ready to run can be created via web interface in a displayed Linux Shell. A runtime environement for C/C++ is supplied for in-house developments. The number of I/Os can be increased by connecting additional expansion modules. Suitable for decentralized mounting on DIN TH35 rail according to IEC 60715 in electrical distribution cabinets.