EL1104

EL1104 is a Beckhoff digital input terminal in the EL EtherCAT Terminals series. It provides four inputs for receiving binary field-device signals. The inputs follow the EN 61131-2 Type 3 signal standard, which establishes their electrical switching characteristics for industrial control systems. Each input draws 3 mA. A 3 ms input filter reduces the effect of brief signal changes, and the terminal transfers four process-image bits, providing one status bit for each input.

The terminal operates from 24 V DC power and uses 0 V as the reference potential for its input signals. Its 500 V isolation voltage provides electrical separation between isolated circuit sections. The IP20 protection class guards against contact with fingers and similarly sized solid objects but does not provide water protection. Distributed Clocks are not supported, so the terminal does not use EtherCAT clock synchronization for timestamped input acquisition.