BECKHOFF

BECKHOFF EL3751 EtherCAT Terminal Multi-Function Analog Input Module

SKU EL3751

In stock
  • 12-month warranty
  • Free returns within 30 days

  • Manufacturer: BECKHOFF

  • Product No.: EL3751

  • Country of origin:Germany

  • Product Type: EtherCAT Terminals

  • Payment: T/T, Western Union

  • Weight: 65g

  • Dimensions: 12 mm x 100 mm x 68 mm

  • Shipping port: Xiamen

  • Warranty: 12 months

Description

Engineered for high-precision industrial data acquisition, the BECKHOFF EL3751 is a single-channel, multi-function analog input EtherCAT Terminal delivering 24-bit resolution at sampling rates up to 10 ksps. This versatile measurement module processes multiple signal types including voltage, current, resistance, temperature via RTDs, and bridge sensors. By leveraging high-speed oversampling and distributed clocks with sub-microsecond synchronization, it ensures precise timing and dynamic control-loop integration.

The unit features a highly flexible input structure supporting 2-, 3-, 4-, 5-, and 6-wire connection configurations, eliminating the need for various dedicated module types. Onboard digital signal processing features include a freely parameterizable numeric filter, TrueRMS calculations, integration/differentiation, and PeakHold extraction. Additionally, an integrated, parameterizable power supply (0.5 to 5 V) is provided directly on-terminal to power external strain gauges and bridge sensors.

Features

  • Single-channel multi-functional measurement with high-precision 24-bit resolution.
  • Oversampling factor configurable from n = 1 to 64 for detailed process image extraction.
  • Distributed clocks functionality synchronized to less than 1 us.
  • Flexible wiring interface supporting 2-, 3-, 4-, 5-, and 6-wire connection technologies.
  • Broad signal support including voltage (+/-30 V down to +/-5 mV), current (+/-20 mA, 4...20 mA), RTDs, resistance, and strain gauges.
  • Integrated parameterizable excitation power supply (0.5 to 5 V) for bridge sensors.
  • Electrical isolation of 500 V between the E-bus and signal electronics.
  • Extended range performance allowing technical measurements up to 107% of the nominal scale.

Applications

  • High-speed test bench automation and dynamic load testing.
  • Precision industrial weighing systems and force measurement.
  • Power generation and electrical grid parameter analysis using TrueRMS calculations.
  • Machine monitoring systems utilizing strain, pressure, and temperature sensors.

Technical Specifications

ManufacturerPart Number / ModelProduct TypeResolutionConversion TimeOversampling FactorDistributed Clocks PrecisionInput ResistanceInput Filter Limit FrequencyDielectric StrengthNominal Measuring RangesTechnical Measuring RangeMeasuring ErrorTemperature CoefficientElectrical IsolationCurrent Consumption E-busWeightOperating TemperatureStorage TemperatureRelative HumidityVibration / Shock ResistanceEMC Immunity / EmissionProtection RatingEx MarkingDimensions (W x H x D)
BECKHOFF
EL3751
EtherCAT Terminal (1-Channel Analog Input)
24 bit (including sign)
100 us / 10 ksps
n = 1 to 64
less than 1 us
greater than 500 kOhm (30 V range), greater than 4 MOhm (other voltage ranges), 150 Ohm (current range)
3 kHz
max. 36 V
+/-30 V, +/-10 V, +/-5 V, +/-2.5 V, +/-1.25 V, +/-640 mV, +/-320 mV, +/-160 mV, +/-80 mV, +/-40 mV, +/-20 mV, +/-10 mV, +/-5 mV, 0...5 V, 0...10 V, +/-20 mA, 0/4...20 mA, NAMUR NE43, 0...5 kOhm, Pt100/Pt1000, Ni, KTY, 1/4 bridge (350 Ohm + 120 Ohm), 1/2 bridge (+/-16 mV/V), full bridge (+/-32 mV/V), potentiometer (greater than or equal to 1 kOhm)
Typically 107% of nominal range (ExtendedRange)
typ. +/-0.01% of full scale value at 23 degC (range dependent)
typ. less than 15 ppm/K (range dependent)
500 V (E-bus / signal voltage)
typ. 260 mA
approx. 65 g
0 to +55 degC
-25 to +85 degC
95%, non-condensing
Conforms to EN 60068-2-6 / EN 60068-2-27
Conforms to EN 61000-6-2 / EN 61000-6-4
IP20
II 3 G Ex nA IIC T4 Gc
12 mm x 100 mm x 68 mm

Connections and Interfaces

Connection Type Specification / Cross-Section
Wiring Technology Spring actuation by screwdriver; solid, flexible, or ferrule conductors
Solid / Stranded Conductor Cross-Section 0.08 to 2.5 mm² (AWG 28 to 14)
Flexible Conductor with Ferrule 0.14 to 1.5 mm² (AWG 26 to 16)
Stripping Length 8 to 9 mm

Installation Guidelines

  • Mount the terminal on a standard 35 mm DIN rail conforming to EN 60715 using the secure locking mechanism.
  • Ensure double slot and key connections are correctly aligned for reliable backplane contact with adjacent EtherCAT terminals.
  • Isolate the power supply before connecting or disconnecting any wiring terminals.
  • Adhere to specified clearance for ventilation to maintain operating temperatures below 55 degC.
  • In hazardous environments, confirm compliance with Zone 2 installation regulations according to classification II 3 G Ex nA IIC T4 Gc.

FAQ

What signal types can the Beckhoff EL3751 process?
The EL3751 is a highly versatile multi-function terminal supporting voltage (+/-30 V down to +/-5 mV), current (+/-20 mA, 0/4...20 mA), NAMUR NE43, resistance (0...5 kOhm), RTDs (Pt100, Pt1000, Ni, KTY), strain gauge bridges (half and full), and potentiometers.

Does the EL3751 require an external excitation voltage for strain gauges?
No, the EL3751 features an integrated, parameterizable power supply ranging from 0.5 to 5 V, enabling direct connection and excitation of strain gauges from the terminal block.

What is the maximum sampling rate and resolution of this module?
The EL3751 offers 24-bit resolution (including sign) with a fast conversion time of 100 microseconds, yielding a sampling rate of up to 10 ksps.

Is the EL3751 suitable for explosive environments?
Yes, the module is certified under ATEX with the Ex marking II 3 G Ex nA IIC T4 Gc, making it suitable for installation in Zone 2 hazardous areas.

View all FAQs →

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Global Express Shipping

  • Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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TECHNICAL SPECIFICATIONS

Country of origin
Germany

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