Beckhoff EL2904 EtherCAT Terminal

The Beckhoff EL2904 is a TwinSAFE digital output terminal with 4 fail-safe outputs for switching 24 V DC actuators up to 0.5 A per channel. Controlled via Safety over EtherCAT (FSoE), it provides precise, fault-tolerant output switching for safety-critical applications. With integrated current measurement, output testing, and standard output fallback logic, it offers advanced safety functionality in a compact form factor.

The EL2904 also supports standard output activation, logically ANDed with safety outputs to enable faster actuation from non-safety systems when permitted. Safety parameters are managed externally by a TwinSAFE Logic device, ensuring serviceability and consistent operation without direct parameter storage on the terminal.

Technical Specifications

Manufacturer: Beckhoff
Part Number: EL2904 Beckhoff
Product Type: Safety Digital Output Terminal
Output Channels: 4 (fail-safe)
Connection Technology: 1-/2-wire
Protocol: TwinSAFE / Safety over EtherCAT (FSoE)
Max Output Current: 0.5 A per channel
Min Output Current (for current measurement): 20 mA
Integrated Current Measurement: Yes
Channel Testing: Configurable
Standard Outputs (Fallback): Yes, with integrated AND logic
Fault Response Time: ≤ Watchdog time (parameterizable)

Electrical & Power

Power Supply: Load-dependent via power contacts
Current Consumption (E-bus): Typ. 221 mA
Electrical Isolation: 500 V (E-bus/field potential)
Protection Rating: IP20

Mechanical Specifications

Dimensions (W x H x D): 24 mm x 100 mm x 68 mm
Housing Type: EL-24-2x8pin
Material: Polycarbonate
Mounting: 35 mm DIN rail (EN 60715)
Side-by-Side Mounting: Double slot and key system
Wiring Type:
– Solid: 0.08–2.5 mm²
– Stranded: 0.08–2.5 mm²
– Ferrule: 0.14–1.5 mm²
AWG Range: AWG28–14 (solid/stranded), AWG26–16 (ferrule)
Stripping Length: 8–9 mm
Max Current Load (Power Contacts): 10 A

Environmental Conditions

Operating Temperature: -25°C to +60°C
Storage Temperature: -40°C to +85°C
Installation Position: Horizontal
Relative Humidity: 95% (non-condensing)
Vibration/Shock Resistance: EN 60068-2-6 / EN 60068-2-27

Approvals & Compliance

Safety Standards:
– EN ISO 13849-1:2008 (Cat. 4, PL e)
– EN 61508:2010 (SIL 3)
Certifications: CE, UL, CCC, ATEX, IECEx, cFMus
ATEX Marking: II 3G Ex ec IIC T4 Gc
IECEx Marking: Ex ec IIC T4 Gc
cFMus:
– Class I, Division 2, Groups A, B, C, D
– Class I, Zone 2, AEx ec IIC T4 Gc

Key Features

✅ 4 Fail-Safe Outputs: 24V DC control up to 0.5 A per channel.

✅ Integrated Current Measurement: Ensures operational safety.

✅ Channel Testing: Activatable for individual diagnostics.

✅ Standard Output Support: AND logic with safety channel for fast switching.

✅ Service-Friendly Design: Parameters stored via TwinSAFE Logic, not on terminal.

📦 Buy Beckhoff EL2904 TwinSAFE Digital Output Terminal – Fast UK Delivery

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Perfect for use in high-integrity machine control systems, the EL2904 delivers certified safety, advanced diagnostics, and streamlined integration into any EtherCAT-based safety architecture.

Get in touch today to request a quote or place your order.