Beckhoff EJ1100-0000 EtherCAT plug-in module, EtherCAT Coupler, RJ45.
The EJ1100 EtherCAT Coupler is the link between the EtherCAT protocol at fieldbus level and the EtherCAT plug-in modules. A module station consists of a coupler and any number of EtherCAT plug-in modules, which are automatically detected and individually displayed in the process image.