Kollmorgen’s EtherCAT® Bus Coupler has been designed to connect the ethernet system with modular, extendable electronic terminal blocks, with a complete unit consisting of a bus coupler, a set of bus terminals and one end terminal. The purpose of a Kollmorgen Bus Coupler is to recognise the connected Bus Terminals and automatically allocate them into the EtherCAT process image. Kollmorgen BusCoupler RemoteIO Datasheet