BECKHOFF EL3751-0020 EtherCAT Terminal

Description

Designed to meet stringent measurement requirements in industrial automation environments, the EL3751-0020 multi-function analog input EtherCAT terminal delivers high-precision signal acquisition. This module enables the acquisition of analog signals with high accuracy under harsh operational conditions. It features a single multi-functional input channel supporting differential connections across 2-, 3-, 4-, 5-, and 6-wire setups, making it highly versatile for interfacing with various industrial sensors, including strain gauges, RTDs, and potentiometers.

Operating with a high-resolution 24-bit analog-to-digital converter, this module achieves a sampling rate up to 10 ksps (kilosamples per second). With integrated distributed clocks, the terminal synchronizes measurement values with sub-microsecond precision across the EtherCAT network. It comes factory calibrated, ensuring reliable measurement accuracy straight from installation without requiring field calibration.

Features

• High-precision 24-bit resolution with an integrated sign bit.
• Fast conversion speed of 100 us per sample (10 ksps sampling rate).
• Oversampling capability with a configurable factor of n = 1 to 64.
• Distributed clock synchronization with jitter specifications well under 1 us.
• Support for multi-wire connections (2-, 3-, 4-, 5-, and 6-wire) with differential inputs.
• Integrated parameterizable power supply for strain gauge sensors (0.5 to 5 V).
• Extended range performance of 107% with a free numeric filter, TrueRMS calculations, and an integrated peak-hold function.

Applications

• High-speed weight and force measurement applications using strain gauges.
• Precision temperature monitoring with multi-wire RTD sensors.
• Test bench systems requiring fast, synchronized signal oversampling.
• Industrial processes requiring high-end feedback control loops in machine building.

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Mount vertically or horizontally on a standard 35 mm DIN rail conforming to EN 60715.
• Ensure secure engagement of the double slot and key connection for reliable backplane contact.
• Use shielded cables for all analog signal paths and connect shields to a low-impedance ground close to the terminal.
• Maintain clear ventilation space around the terminal to preserve the rated ambient temperature limit.

Compliance and Certifications

• CE
• UL
• ATEX: II 3 G Ex nA IIC T4 Gc
• EMC Immunity/Emission: Conforms to EN 61000-6-2 and EN 61000-6-4
• Vibration/Shock Resistance: Conforms to EN 60068-2-6 and EN 60068-2-27