EL3051 1-Channel Current Input Terminal | Beckhoff EtherCAT Module

EL3051 EtherCAT Terminal – 1-Channel Analog Input, 4…20 mA, 12-Bit

Brand: Beckhoff | Model: EL3051 | Series: EtherCAT Terminal

Product Status: Regular delivery. The EL3051 supplies field transducers and transmits isolated analog signals to automation devices. Sensor power comes via the power contacts. The input electronics operate independently from the power contact supply. LED indicators show signal state, overload, and wire break.

Key Features at a Glance

• 1 analog input – single-ended, 4…20 mA
• 12-bit resolution – 16-bit presentation incl. sign
• Fast conversion – 0.625 ms (default, configurable multiplex)
• Input filter – 1 kHz limit frequency
• Diagnostics – overload & broken wire LEDs
• Compact design – 12 mm width, polycarbonate housing

Technical Specifications

• Measurement range: 4…20 mA (single-ended)
• Frequency response: Input filter limit 1 kHz
• Sensitivity: 12-bit resolution (16-bit presentation)
• Linearity: Measurement error < ±0.3 % (full scale)
• Resolution: 12 bit (16-bit data format)
• Temperature range: Operating -25…+60 °C / Storage -40…+85 °C
• Environmental tolerance: 95 % RH non-condensing; vibration/shock per EN 60068-2-6/EN 60068-2-27
• Immunity/EMC: Conforms to EN 61000-6-2 (immunity) & EN 61000-6-4 (emission)
• Internal resistance: Typ. 85 Ω
• Dielectric strength: Max. 30 V; 500 V isolation (E-bus/signal)
• Current consumption: E-bus typ. 130 mA; Power contacts Imax 10 A
• Bit width: 4 bytes input in process image
• Special features: Standard/compact process image, FIR/IIR filters, limit monitoring
• Weight: Approx. 60 g
• Protection rating: IP20; variable installation position
• Wiring: Spring actuation by screwdriver; solid/flexible/ferrule 0.08…2.5 mm² (AWG 28…14)
• Stripping length: 8…9 mm (EL) / 9…10 mm (ES)

Installation & Commissioning

• Mounting: Snap onto 35 mm DIN rail (EN 60715) with lock.
• Side-by-side: Double slot and key connection for secure adjacent mounting.
• Wiring: Use screwdriver for spring actuation – solid/flexible/ferrule up to 2.5 mm².
• Power contacts: Optionally supply via standard or isolated EL9xxx terminal.
• Commissioning: Default conversion 0.625 ms; configure FIR/IIR filters and limit values via EtherCAT.
• Maintenance: LED diagnostics for overload and wire break reduce troubleshooting time.

Compatibility & Approvals

• Bus system: EtherCAT (E-bus) – fully compatible with all Beckhoff EL/ES terminals.
• Process image: Standard and compact modes, 4-byte input data.
• Approvals: CE, UL, ATEX (II 3 G Ex nA IIC T4 Gc), IECEx (Ex ec IIC T4 Gc).
• Housing: EL-12-8pin (standard) or ES-12-8pin (pluggable wiring).

Package Contents & Warranty

• In the box: 1 × EL3051 terminal, documentation download card.
• Warranty: 12 months against manufacturing defects.
• Shipping: 12–24 hours dispatch via FedEx, UPS, or DHL (tracking provided).

Expert Review – Manager’s Insight

Precision for critical current loops. The EL3051 delivers reliable 4…20 mA measurement with 12-bit resolution. Its 0.625 ms conversion suits fast control tasks. The integrated FIR/IIR filters help reduce noise in harsh environments. For plant engineers, the diagnostic LEDs and compact footprint reduce panel space and downtime. A solid choice for cost‑effective analog input in EtherCAT systems.

Applications & Suitable Devices

• Process automation: Pressure, level, flow transmitters (4…20 mA).
• Machine building: Analog feedback from sensors in servo drives.
• Factory automation: Monitoring temperature, humidity, or current loops.
• Compatible with: All Beckhoff CX, BX, and IPC controllers with EtherCAT.
• Ideal for: Distributed I/O nodes where single-ended current input is required.

Frequently Asked Questions

Q: What is the difference between EL3051 and ES3051?
A: ES3051 features pluggable wiring (spring terminals) for faster replacement. Both share the same electrical specifications.

Q: Can I connect a 2-wire transmitter?
A: Yes, the terminal supplies loop power via the power contacts. Ensure the power contact voltage matches the transmitter requirement.

Q: How do I enable the FIR/IIR filters?
A: Configure via the EtherCAT CoE objects (index 0x8000) using TwinCAT or any EtherCAT master.

Q: What is the maximum cable length for the analog input?
A: Keep shielded cable below 30 m to maintain accuracy and reduce noise pickup.

Q: Is the terminal suitable for Ex zones?
A: Yes, it carries ATEX and IECEx Ex ec IIC T4 Gc – for Zone 2 (gas) and Zone 22 (dust) applications.

Q: Which power contact voltage should I use?
A: The terminal is isolated; use 24 V DC typical. Voltage must not exceed 30 V (dielectric strength limit).

Selection Guide – How to Choose

• Need single-ended current input? EL3051 is your choice.
• Require differential input? Consider EL3052 (2-channel) or EL3054 (4-channel).
• Faster conversion? EL3051 offers 0.625 ms – if you need sub‑ms, check EL3751 (10 µs).
• Pluggable wiring preferred? Order ES3051 (same specs, different termination).
• Need Ex certification? Both EL3051 and ES3051 carry ATEX/IECEx.

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