BECKHOFF EL3751 EtherCAT Terminal Multi-Function Analog Input Module

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

Connections and Interfaces

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.