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EtherCAT Coupler Colour coding signal type Additional functions, e.g. relays or DIP switches Safety plug-in modules: – EJ1904: 4-channel digital input, TwinSAFE – EJ2904: 4-channel digital output, TwinSAFE – EJ6900: TwinSAFE PLC Digital and analog plug-in modules Motion modules Status and diagnostic LEDs Machine-specific connection level News | I/O Highlights – – – – – – – – – – 6 very compact EtherCAT I/O solution made by Beckhoff: the inventor of EtherCAT reduced installation costs application-specific connector interface safety integrated use of cable harnesses avoids wiring errors modular and flexible based on the same technology as the Beckhoff EtherCAT Terminals, the largest EtherCAT I/O portfolio on the market optimised for high-volume production improved diagnostics