The Beckhoff EL3351 EtherCAT Terminal is a specialised analogue input module designed to measure electrical signals from full-bridge sensors with precision and flexibility. Featuring a single channel that supports one full measuring bridge, the EL3351 is particularly suited to applications involving force, pressure, torque, and weight measurement, where accuracy and stability are critical.

The terminal is engineered to capture small differential voltages with a measuring range of ±20 mV (UD), making it ideal for strain gauge and bridge-based sensor applications. Additionally, it supports a reference voltage (UREF) range of up to ±12 V, ensuring compatibility with a wide variety of transducer configurations. With an internal resistance of greater than 200 kΩ for UREF and over 1 MΩ for UD, the EL3351 guarantees minimal signal loading, preserving measurement accuracy even when connected to sensitive sensors.

One of the defining features of the EL3351 is its 16-bit resolution, which delivers high precision in converting analogue bridge signals into digital values. This resolution allows even the smallest variations in sensor output to be detected and processed, enabling reliable monitoring of mechanical processes where accuracy is paramount.

Flexibility is built into the design of the EL3351. The nominal sensitivity of the connected bridge sensor is freely selectable and calculated in the PLC, giving users complete control over scaling and adaptation to specific application needs. Furthermore, the terminal incorporates an input filter with a default limit frequency of 50 Hz, which can be parameterised to match application requirements. This ensures a balance between fast response and noise suppression, particularly valuable in environments where signal stability is as important as speed.

Powered directly via the E-bus, the EL3351 integrates seamlessly into Beckhoff’s EtherCAT I/O system. This ensures high-speed, deterministic communication with the controller, allowing measurement values to be updated in real time and synchronised with other process data across the network. Its compact format also means that high-density installations can be achieved without sacrificing performance or functionality.

The EL3351 is an excellent choice for applications in industrial automation, robotics, test benches, and process monitoring, where accurate force or weight detection is needed. Whether used for load monitoring in production machinery, torque measurement in rotating systems, or precision weighing in material handling, the terminal provides a reliable and scalable solution.

In summary, the Beckhoff EL3351 offers a robust, high-resolution, and configurable input module for bridge-based sensor measurements. Combining precision, adaptability, and seamless EtherCAT integration, it provides engineers with the tools needed to achieve dependable and accurate data acquisition in demanding industrial environments.