EL3004 BECKHOFF 4-Channel Analog Input Terminal ±10 V

Product Overview

The EL3004 (EL3004) is a high-density 4-channel analog input terminal designed for the EtherCAT I/O system, specializing in the processing of bipolar voltage signals from -10 V to +10 V. With a 12-bit resolution, it provides a reliable and cost-effective solution for B2B industrial applications such as joystick control monitoring, actuator position feedback, and general DC voltage measurement. Utilizing single-ended technology, the EL3004 packs four independent channels into a slim 12 mm width, offering an exceptional I/O density that optimizes control cabinet space.

Technical Configuration (Deep Dive)

The EL3004 operates using a multiplexing conversion method with a default conversion time of 0.625 ms. This makes it an ideal fit for standard automation tasks where ultra-high-speed synchronization (Distributed Clocks) is not a requirement. To maintain signal integrity in noisy environments, the terminal features a 1 kHz hardware filter and software-configurable FIR (Finite Impulse Response) and IIR (Infinite Impulse Response) filters.

The process data is presented in a 16-bit format (including sign) for seamless integration with PLC mathematical functions. Furthermore, the EL3004 includes overload display functionality within the process data, allowing the controller to immediately identify if a sensor's voltage output has exceeded the measurable range. The terminal is designed for rugged industrial use, featuring 500 V electrical isolation and ATEX certification for Zone 2 hazardous areas.

Technical Specifications

Technical FAQs

What is the benefit of "Single-Ended" wiring for the EL3004?

In a single-ended configuration, all four voltage inputs share a common internal ground reference. This significantly reduces wiring complexity and terminal width, allowing you to monitor four different signals with fewer connection points, provided the sensors share a common reference potential.

How does the overload display function?

If the input voltage exceeds the ±10 V range (up to the maximum dielectric strength of 30 V), the EL3004 sets an overload bit in the EtherCAT process image. This allows your PLC logic to trigger safety routines or HMI alerts immediately, preventing erroneous data from being used in control calculations.

Is this terminal compatible with standard 0-10 V sensors?

Yes. While the EL3004 is rated for bipolar ±10 V, it can easily process unipolar 0-10 V signals. The 12-bit resolution will simply map the 0-10 V range to a portion of the total digital representation.

Engineering & Installation Guide

• Wiring for Precision: To ensure accurate 12-bit readings, always use shielded cabling. The cable shield should be connected to the functional earth (FE) via a shield bus or low-impedance clamp as close to the terminal as possible to minimize electromagnetic interference (EMI).

• Grounding Considerations: Since this is a single-ended terminal, ensure that no significant potential differences exist between the ground points of the four different sensors. Large ground offsets can lead to measurement errors or, in extreme cases, damage to the terminal.

• Maintenance: The EL3004 supports ES series pluggable wiring, allowing the terminal block to be removed without disconnecting individual signal leads. This feature drastically reduces downtime during maintenance or when expanding the I/O segment.

Engineering Advantages

The EL3004 offers an excellent balance of density and diagnostic capability. Its high input resistance (> 130 kΩ) ensures minimal loading of the signal source, preserving the accuracy of the measured voltage. Compliance with EN 61000-6-2/4 for EMC ensures that the terminal remains stable even in environments with high electrical noise. For B2B machine builders, the ability to activate limit value monitoring within the terminal hardware offloads processing from the CPU, enabling faster and more responsive local monitoring of critical voltage thresholds.