The Beckhoff EL3122 EtherCAT Terminal is a powerful analog input module designed to capture current signals in the widely used 4…20 mA range with outstanding accuracy and reliability. Equipped with two differential input channels and a 16-bit resolution, it is particularly suited for applications where precise current measurement is essential, such as process automation, machine monitoring, and sensor integration.

By using differential inputs, the EL3122 ensures enhanced noise immunity compared to single-ended designs, making it highly reliable even in electrically noisy industrial environments. This feature is critical for maintaining the integrity of measurement data, especially in large-scale plants or facilities where long cable runs and multiple sources of electrical interference are common. The module’s internal resistance of approximately 85 Ω plus diode voltage ensures stable operation and secure signal acquisition across diverse applications.

The EL3122 supports current signals within the 4…20 mA range, the industry-standard format for transmitting analog process variables such as temperature, pressure, flow, or level. Its compatibility with this format makes it highly versatile and easy to integrate into existing automation systems. In addition, the integrated 5 kHz input filter helps eliminate unwanted noise, allowing clean and accurate data to be recorded even under demanding conditions.

The module is powered directly via the E-bus, reducing the complexity of wiring and streamlining its integration into EtherCAT-based I/O systems. With its support for distributed clocks, the EL3122 enables precise synchronisation of measured data across the entire EtherCAT network. This ensures that process variables are time-stamped with high accuracy, a crucial feature for coordinated control systems, motion applications, and data logging tasks where timing precision is key.

The EL3122 is designed to withstand challenging industrial environments, offering tolerance for common-mode voltages up to 10 V. This ensures stable performance even in cases where ground potential differences or system disturbances may occur. Such resilience helps maintain system uptime and protects against data inconsistencies.

Practical applications of the EL3122 include monitoring industrial sensors, capturing analogue field signals, and integrating measurement loops into PLCs or distributed control systems. Whether deployed in manufacturing, utilities, or process industries, it provides a reliable interface between the physical process and the digital control layer.

Compact, durable, and built to Beckhoff’s high standards, the EL3122 offers engineers a dependable and accurate solution for current signal measurement. By combining precise differential measurement, advanced synchronisation, and robust input design, it enables automation systems to achieve greater accuracy, stability, and efficiency.