Beckhoff EL1904 TwinSAFE EtherCAT 4-Channel Safety Digital Input Terminal

Beckhoff · HMIs & Displays

Description  The Beckhoff EL1904 is a TwinSAFE EtherCAT input terminal designed for safety-related signal acquisition from potential-free 24 V DC contacts. It provides four independent fail-safe input channels and delivers safety-relevant data to a TwinSAFE logic component via FSoE communication.     Technical Specifications  Condition New/Never Used Surplus Brand Beckhoff Category I/O Modules Part Number EL1904 Subcategory EtherCAT TwinSAFE Digital Input Terminal Number of Inputs 4 safe digital inputs Connection Technology 1-/2-wire Nominal Voltage 24 V DC (potential-free contacts) Protocol TwinSAFE / FSoE (Safety over EtherCAT) Response Time Typ. 4 ms (read input/write to E-bus) Fault Response Time ≤ Watchdog time (parameterizable) Cross-Circuit Detection Yes Channel Evaluation 1-channel or 2-channel selectable Current Consumption (E-bus) Typ. 200 mA Safety Standards Cat. 4 / PL e (EN ISO 13849-1), SIL 3 (EN 61508) Installation Position Horizontal Electrical Isolation Safety-certified EtherCAT isolation design Operating Temperature Standard EtherCAT terminal range (per documentation) Weight Approx. 50 g       Information About EL1904 The EL1904 is a TwinSAFE EtherCAT digital input terminal designed for acquiring safety-relevant 24 V DC signals through four fail-safe channels, transmitting them to a TwinSAFE Logic component via Fail Safe over EtherCAT (FSoE). It supports configurable safety parameters such as 1- or 2-channel evaluation, individual channel testing, and cross-circuit detection, ensuring flexibility for various safety architectures. Because parameters are stored in the logic controller rather than the terminal, replacement is simplified—installing a new terminal automatically restores all safety settings upon application start. Engineered to meet SIL 3 and PL e safety requirements, the EL1904 provides dependable, high-integrity safety integration for modern EtherCAT systems. Key Features: Four Independent Fail-Safe Inputs: Supports potential-free 24 V DC sensors such as emergency stop switches, interlocks, and safety contacts with high reliability. TwinSAFE FSoE Communication: Ensures secure, deterministic safety data transfer directly to TwinSAFE Logic components for real-time evaluation. Flexible Safety Evaluation: Allows per-channel configuration for 1-channel or 2-channel redundancy, enabling adaptation to various safety designs and required PL/SIL levels. Cross-Circuit and Wiring Fault Detection: Automatically identifies short circuits, open circuits, and unintended cross-connections to prevent unsafe states. Software-Stored Safety Parameters: Parameters reside in the logic device, not the terminal, enabling plug-and-play replacement without reconfiguration. Individual Channel Test Functions: Enables activation of test pulses for each input, improving diagnostic coverage and compliance with high safety categories. Fast Response Time: Typical 4 ms input-to-bus processing ensures rapid reaction to safety events in time-critical applications. Certified for High Safety Standards: Meets SIL 3 (EN 61508) and PL e Category 4 (EN ISO 13849-1), supporting demanding machine safety requirements. Compact EtherCAT Terminal Design: Offers high channel density and seamless cabinet integration while maintaining electrical isolation and robust performance. The EL1904 delivers the reliability, diagnostics, and functional safety depth required for advanced EtherCAT-based safety architectures.

Brand: Beckhoff · Category: HMIs & Displays

Key features

• Four Independent Fail-Safe Inputs: Supports potential-free 24 V DC sensors such as emergency stop switches, interlocks, and safety contacts with high reliability.
• TwinSAFE FSoE Communication: Ensures secure, deterministic safety data transfer directly to TwinSAFE Logic components for real-time evaluation.
• Flexible Safety Evaluation: Allows per-channel configuration for 1-channel or 2-channel redundancy, enabling adaptation to various safety designs and required PL/SIL levels.
• Cross-Circuit and Wiring Fault Detection: Automatically identifies short circuits, open circuits, and unintended cross-connections to prevent unsafe states.
• Software-Stored Safety Parameters: Parameters reside in the logic device, not the terminal, enabling plug-and-play replacement without reconfiguration.
• Individual Channel Test Functions: Enables activation of test pulses for each input, improving diagnostic coverage and compliance with high safety categories.
• Fast Response Time: Typical 4 ms input-to-bus processing ensures rapid reaction to safety events in time-critical applications.
• Certified for High Safety Standards: Meets SIL 3 (EN 61508) and PL e Category 4 (EN ISO 13849-1), supporting demanding machine safety requirements.
• Compact EtherCAT Terminal Design: Offers high channel density and seamless cabinet integration while maintaining electrical isolation and robust performance.

Specifications

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