ABB FENA-01 Ethernet Adapter, ACS310, ACS355 Ethernet Adapter. Supports both Modbus-TCP and EtherNet/IP network protocols. The Modbus-TCP protocol is simply the Modbus protocol used on top of Ethernet-TCP/IP. Modbus-TCP is an open Industrial Ethernet network which has been specified by the Modbus-IDA User Organization. EtherNet/IP is based on the Common Industrial Protocol (CIP), which is also the framework for both the ControlNet and DeviceNet network protocols. The FENA-01 supports 10/100 Mbps transfer rate with network connections made with CAT 5 wiring and RJ-45 connectors. Both star and bus topology options are supported. Used with the ACS355 Series Drives, not compatible with ACS310 Series.