Product Overview

The EL3011 (EL3011) is a high-precision EtherCAT Terminal designed for capturing analog current signals within a 0 to 20 mA range. As part of the modular BECKHOFF I/O system, this 1-channel differential input module utilizes advanced 12-bit resolution technology to deliver accurate data acquisition for demanding industrial processes. Whether deployed in power generation, chemical processing, or high-speed manufacturing, the EL3011 provides the electrical isolation and signal integrity required to interface sensitive sensors with centralized control systems. Its compact 12 mm housing optimizes cabinet space while the EtherCAT protocol ensures ultra-low latency communication across the E-bus.

Differential Signal Processing and Filtering

The EL3011 stands out through its differential input technology, which effectively suppresses common-mode interference—a critical requirement in electrically noisy environments. With a default conversion time of 0.625 ms and an internal input filter limit frequency of 1 kHz, the module balances speed with signal stability. Engineers can further refine data quality using the module’s activatable FIR/IIR filters and integrated limit value monitoring. This allows for real-time preprocessing of signals, reducing the computational load on the primary PLC and ensuring that only clean, actionable data enters the process image.

Technical Specifications

Engineering FAQ & Diagnostics

How does the 12-bit resolution translate to the 16-bit process image?

The EL3011 hardware captures data at a 12-bit depth. For software compatibility within the EtherCAT ecosystem, this value is mapped into a 16-bit integer format (sign-extended). This ensures that the PLC receives a standardized data width while maintaining the specific accuracy of the 12-bit hardware converter.

What are the benefits of the integrated FIR/IIR filters?

These digital filters allow users to suppress specific frequency interference (like 50 Hz or 60 Hz line noise). By activating these filters via the CoE (CanOpen over EtherCAT) directory, you can achieve a significantly higher signal-to-noise ratio in environments with heavy electromagnetic motor interference.

What happens if the input current exceeds 20 mA?

The module features a surge voltage resistance of 35 VDC. However, sustained current significantly above the 20 mA threshold may saturate the 12-bit converter. The integrated limit value monitoring can be configured to trigger an error bit in the process image to alert the operator of an over-range condition.

Field Wiring and Installation Guide

• Differential Connection Integrity: To maximize the benefits of the differential input, ensure that both signal wires (positive and negative) are twisted together and shielded. Connect the shield to the designated ground terminal on the terminal block or the DIN rail via a shield bus to drain high-frequency noise.

• Spring-Loaded Termination: The EL3011 utilizes a screwless tension spring connection. Use a standard flat-head screwdriver to actuate the spring. Ensure the stripping length is exactly 8 to 9 mm; exposed copper outside the terminal or insulation trapped inside the spring will lead to intermittent signal loss or increased resistance.

• E-Bus Power Planning: This module consumes typically 130 mA from the E-bus. When designing your terminal island, calculate the total current draw of all connected EL-series modules to determine if an additional EK1110 or EL9410 power supply terminal is required to maintain E-bus voltage stability.

Technical Advantages and Robustness

Designed for global deployment, the EL3011 carries ATEX and UL certifications, making it suitable for hazardous areas (Ex nA IIC T4 Gc). Its polycarbonate construction and IP20 rating provide a rugged shell that conforms to EN 60068 standards for vibration and shock resistance. The module’s ability to operate in temperatures as low as -25 Celsius makes it an ideal candidate for outdoor control cabinets in infrastructure and energy sectors.