Beckhoff EL2904 EtherCAT IO Terminal 4 Channel

Beckhoff EL2904 is a TwinSAFE EtherCAT terminal with four 24 V DC digital outputs, each rated for 0.5 A, designed for safety-critical I/O in distributed automation. As part of Beckhoff's ELx9xx TwinSAFE family, the module delivers safety-certified digital switching that integrates with TwinCAT software and a TwinSAFE-capable master for safety applications such as guarded actuators and emergency-stop circuits. The terminal draws about 221 mA from the E-bus and requires a 24 V SELV/PELV supply; for the protected group, a 10 A fuse is recommended. Electrical isolation exists between the E-bus and each channel, while isolation between channels is not provided; insulation between the channels and the E-bus is rated up to 500 V DC. Physical dimensions are 24 mm wide, 100 mm high, and 68 mm deep, with a weight of approximately 100 g, and it carries IP20 protection. Typical power loss is around 2 W. Certifications include TwinSAFE safety (and EN 61508/SIL 3 readiness) with some variants bearing Ex marking II 3 G Ex nA IIC T4 Gc, reflecting suitability for specialized environments when configured accordingly. The EL2904 is intended for straightforward integration with Beckhoff EtherCAT masters and safety logic, enabling four digitally controlled outputs for actuators, relays, or safety devices within compact automation installations.