The Beckhoff EL3204 EtherCAT Terminal is a high-precision, 4-channel analog input module designed for the direct connection of resistance temperature detectors (RTDs) such as Pt100 or Ni sensors. With its ability to capture four independent temperature signals simultaneously, the EL3204 provides an efficient and space-saving solution for temperature monitoring and control in industrial automation systems.

Each input is capable of measuring a broad temperature range, from -200…+850 °C for Pt sensors and -60…+250 °C for Ni sensors, making the terminal versatile for a wide variety of industrial environments, from cryogenic applications to high-temperature processes. With 16-bit resolution, the EL3204 delivers accurate and finely detailed measurement data, enabling engineers to maintain tight process tolerances and ensure high product quality.

The terminal uses a 2-wire connection method, simplifying wiring while still providing reliable measurement results. With a typical input filter limit frequency of 1 kHz, it can effectively reject electrical noise, ensuring stable and consistent readings in environments with potential signal interference.

Flexibility is a key strength of the EL3204. It offers a default conversion time of 85 ms, but users can configure the conversion rate between 2 and 800 ms depending on the needs of their application. Faster conversion rates are beneficial for dynamic processes that require rapid updates, while slower rates can be chosen for applications prioritising noise reduction and measurement stability.

The module applies a low measuring current (< 0.5 mA, load-dependent) to the sensors, ensuring minimal self-heating and accurate temperature readings. This careful design consideration improves sensor longevity and measurement reliability over continuous operation.

Powered directly via the E-bus, the EL3204 integrates seamlessly into Beckhoff’s modular EtherCAT I/O system. All measured values are mapped directly into the process image and are immediately available to the control system. This eliminates the need for external converters or signal conditioning devices, simplifying system design while reducing installation effort and overall costs.

The EL3204 is especially well-suited for applications requiring multi-point temperature monitoring, such as process industries, food and beverage production, plastics manufacturing, and HVAC systems. Its ability to capture precise, real-time data from multiple RTD sensors allows for optimised process control, energy efficiency, and predictive maintenance strategies.

With its compact housing and robust design, the EL3204 offers both high channel density and long-term durability. It allows automation engineers to integrate accurate temperature measurement directly into EtherCAT architectures, supporting both scalability and future-ready system design.

In summary, the Beckhoff EL3204 EtherCAT Terminal provides a compact, accurate, and flexible solution for temperature acquisition with RTD sensors. With its four input channels, wide measuring range, configurable conversion times, and seamless EtherCAT integration, it is an ideal choice for modern industrial automation systems.