Beckhoff EL2911 – Safe I/O Terminal with TwinSAFE Logic & 10A Output

EL2911 | TwinSAFE Terminal – 4 Safe Inputs + 1 Safe Output (10 A)

EL2911 is a TwinSAFE component.
It provides a safe 24 V DC supply up to 10 A.
It creates safe potential groups within a terminal segment.
This allows standard terminals to be safely switched off.
The terminal has 4 safe inputs and 1 safe output.
It also includes TwinSAFE Logic (like EL6910).
Up to 128 safe connections are supported.

Key Features

• 4 safe digital inputs for sensor monitoring
• 1 safe output with 10 A switching capacity
• Integrated TwinSAFE Logic (functions like EL6910)
• Up to 128 safe connections for complex safety networks
• Safe potential groups – shut down standard I/O safely
• Test pulse configuration per input channel
• AND logic with safe output to activate standard outputs
• Fail‑safe response – switches to safe state on error

Technical Data – EL2911

• Brand: Beckhoff
• Model: EL2911
• Series: TwinSAFE / EtherCAT Terminal
• Type: 4‑channel DI + 1‑channel DO (safe)
• Output current: 10 A max.
• Protocol: TwinSAFE / Safety over EtherCAT (FSoE)
• Fault response time: ≤ watchdog time (adjustable)
• E‑bus current: typ. 180 mA
• Power contacts: load‑dependent, max. 10 A
• Safety standards: EN ISO 13849‑1 (Cat. 4, PL e) and EN 61508 (SIL 3)
• Weight: approx. 98 g
• Protection: IP20
• Dimensions (W x H x D): 24 mm x 100 mm x 68 mm
• Mounting: 35 mm DIN rail (EN 60715)
• Wiring: spring actuation, 0.08 … 2.5 mm² (AWG 28…14)
• Stripping length: 8 … 9 mm
• Installation position: horizontal

Installation & Wiring

• Mount: snap onto 35 mm DIN rail.
• Connect: use 1‑ or 2‑wire connections or power contacts.
• Wire size: solid/stranded 0.08…2.5 mm² (AWG 28…14).
• Strip length: 8…9 mm – use a screwdriver for spring actuation.
• Labeling: use BZxxx series markers.

Commissioning & Maintenance

• Safety parameters are stored in the TwinSAFE Logic component, not on the EL2911.
• Easy replacement – parameters transfer automatically on restart.
• Diagnostic LEDs show channel status and faults.
• Configure test pulses per input for fine‑tuned diagnostics.

Compatibility & System Integration

• Works with all EtherCAT terminals (EL series).
• Requires a TwinSAFE Logic‑capable component for parameter transfer.
• Can act as a standalone safety controller (like EL6910).
• Supports FSoE (Safety over EtherCAT) communication.
• Integrates standard outputs via AND logic with safe signal.

Certifications & Safety Approvals

• EN ISO 13849‑1: Category 4, Performance Level e
• EN 61508: SIL 3
• IP20 protection – suitable for control cabinets

Package Contents

• 1 × EL2911 TwinSAFE Terminal
• Documentation

Warranty & Shipping

• Warranty: 12 months against manufacturing defects.
• Dispatch: 12‑24 hours (business days).
• Carriers: FedEx, UPS, DHL.

Expert Review

“The EL2911 combines safety I/O and logic in one compact device.
It simplifies safety system design by eliminating extra controllers.
The 10 A output handles large loads directly, and the flexible
test pulse configuration ensures robust diagnostics.”

Manager’s Insight

“From a project efficiency standpoint, the EL2911 is a game‑changer.
It reduces hardware count and wiring complexity.
The ability to create safe potential groups means standard I/O
can be used in safety zones without extra relays.
Excellent for cost‑effective safety solutions.”

Applications & Suitable Devices

• Emergency stop systems – monitor E‑stop buttons and switch power
• Guard door monitoring – 4 safe inputs for door switches
• Light curtain integration – connect safety sensors directly
• Safe output control – switch contactors or valves up to 10 A
• Local safety controller – replace EL6910 in smaller applications
• Works with all Beckhoff EL series terminals and EtherCAT couplers.

Comparison with Similar Models

• EL6910 – TwinSAFE Logic controller (no I/O, more connections).
  Choose EL6910 for larger safety networks (>128 connections).
• EL2904 – 4‑channel safe output terminal (no inputs or logic).
  Use with a separate safety controller.
• EL1904 – 4‑channel safe input terminal (no output or logic).
  Pair with EL6910 for safety I/O.
• EL2911 – all‑in‑one solution with 4 inputs, 1 output, and built‑in logic.

FAQ – Frequently Asked Questions

• What is the maximum output current?
  10 A continuous – suitable for direct load switching.
• Does it work without a separate safety controller?
  Yes, it has built‑in TwinSAFE Logic (like EL6910).
• How are safety parameters stored?
  They are stored in the TwinSAFE Logic component, not on the EL2911 itself.
• Can I replace the terminal without re‑configuring?
  Yes – parameters transfer automatically when the safety application restarts.
• How many safe connections are supported?
  Up to 128 safe connections (fewer than EL6910, but enough for most machines).
• What is the fault response time?
  ≤ watchdog time – adjustable via parameterisation.
• Is it SIL 3 certified?
  Yes, EN 61508 SIL 3 and EN ISO 13849‑1 Cat. 4 PL e.

Selection Guide – Which TwinSAFE Terminal to Choose?

• Need just safe inputs? Choose EL1904.
• Need just safe outputs? Choose EL2904.
• Need logic + many connections (>128)? Choose EL6910.
• Need inputs, output, and logic in one? Choose EL2911 – all‑in‑one.
• For local safety cells – EL2911 is the most compact and cost‑effective.

Contact Information:
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+86 18030005825 (WhatsApp)

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