The compact Ethernet I/O modules offer multiprotocol plug-and-play functionality. The FEN20 devices with digital inputs and outputs can be used in Profinet, Modbus TCP or EtherNet/IP systems. The device detects the protocol used by listening to the communication traffic during the startup phase. The devices are available in two designs. The 4DIP-4DXP measures 55 by 62.5 by 30 mm and fits in small control boxes, control panels or other existing housings and can be retrofitted to make pushbuttons and LED indicators Ethernet-ready. The 16DXP variant measures 57 x 152 x 47 mm is designed for the same type of application and provides up to 16 I/Os.