Beckhoff Automation EL1904 Digital Input Module

The Beckhoff EL1904 EtherCAT Terminal is a four-channel digital input module rated for 24 V DC, built as a TwinSAFE safety input terminal for safety-related automation tasks. It accepts sensors with potential-free (floating) contacts and feeds their states into the EtherCAT cycle for deterministic control, making it well-suited for emergency-stop, interlock, and guard-signal monitoring in automated machinery. This 4-channel input block is a compact Beckhoff module with an IP20 enclosure, weighs about 50 g, and operates from -25 to +55 degrees Celsius, designed to withstand typical factory environments. When powered from the Beckhoff E-bus, it draws roughly 200 mA and delivers a characteristic input response time around 4 ms, enabling prompt reactions in safety-critical applications.