EL1904

EL1904 is a Beckhoff safety input terminal in the EL EtherCAT Terminals series. It provides four inputs for receiving safety-related signals and communicates through the TwinSAFE/Safety over EtherCAT protocol. The terminal has a 4 ms response time, supporting prompt processing of input state changes. Its input and output process images are each 6 bytes, providing the data areas used to exchange status and control information with the EtherCAT system.

The terminal operates from a 24 V DC supply. Its clock output supports a maximum current of 15 mA for connected input circuits. An insulation voltage of at least 500 V DC provides electrical separation between applicable circuits. Protection Class III indicates operation using safety extra-low voltage, while the IP20 rating provides protection against contact with fingers and similarly sized solid objects but not against water.

The EL1904 achieves Performance Level PL e for safety-related control applications. Its PFHd value is 1.11E-09, indicating the probability of a dangerous failure per hour. The housing measures 12 mm in width, 100 mm in height, and 68 mm in depth, allowing installation in compact terminal assemblies.