BECKHOFF EL3702 EtherCAT Terminal

Description

The BECKHOFF EL3702 is a high-performance 2-channel analog input terminal designed for high-speed, high-precision voltage measurements. Operating within the modular EtherCAT I/O system, this terminal supports differential signal acquisition in the range of -10 to +10 V with 16-bit resolution. It is engineered specifically for dynamic measurement tasks requiring synchronous, high-frequency data collection across distributed control systems.

A key capability of the BECKHOFF EL3702 is its support for oversampling technology. This allows the terminal to sample analog input values at rates far higher than the master control cycle time. By utilizing EtherCAT Distributed Clocks (DC), the acquired measurements are precisely timestamped and synchronized across the network with sub-microsecond precision, making it an excellent choice for detailed signal analysis and transient state monitoring.

Features

• Two differential analog input channels designed for ±10 V voltage signals.
• Oversampling technology with a selectable factor (n = 1 to 100) for custom data acquisition profiles.
• Maximum sampling rate of 10 microseconds (100 ksamples/s) per channel, executed simultaneously.
• 16-bit analog-to-digital conversion resolution (including sign) for high-fidelity signal reconstruction.
• Integrated Distributed Clocks (DC) support, delivering synchronization precision of less than 1 microsecond.
• 500 V electrical isolation between the E-bus logic and the incoming signal voltage.
• Compact 12 mm housing with status LEDs indicating operational and diagnostic states.

Applications

• High-speed transient signal and wave recording.
• Vibration analysis, acoustic measurement, and structural health monitoring.
• Dynamic force, pressure, or torque monitoring in test benches.
• Fast closed-loop control systems where low-latency feedback is critical.
• Quality control systems requiring high-frequency sensor signal analysis.

Technical Specifications

General

Signal and I/O

Electrical

Performance and Synchronization

Connection

Environmental and Safety

Installation Guidelines

1. De-energize the System: Always disconnect the power supply to the entire bus terminal block before inserting, removing, or wiring any module.
2. DIN Rail Mounting: Slide the EL3702 terminal onto a standard 35 mm DIN rail (EN 60715) until the lock clicks securely into place.
3. Terminal Connection: Ensure the terminal is pushed flush against adjacent modules to guarantee reliable contact for the E-bus and potential connections.
4. Wiring: Insert a suitable screwdriver into the release slot to open the spring clamp, feed the stripped conductor (8 to 9 mm) into the contact point, and release. Use shielded cables for analog signals to minimize electromagnetic interference.
5. Configuration: Scan the terminal in the TwinCAT System Manager, select the required oversampling factor, and link the resulting process image variables to your control application.