EL3152 BECKHOFF 2-Channel Analog Input Terminal 4–20 mA

Product Overview

The EL3152 (EL3152) is a high-precision 2-channel analog input terminal designed for the EtherCAT I/O system, specifically engineered to process standard 4 to 20 mA current signals. With a high 16-bit resolution, it provides the granular detail required for demanding B2B industrial applications such as pressure sensing, flow monitoring, and temperature regulation in process engineering. The EL3152 utilizes single-ended technology, meaning the inputs share a common internal ground, which optimizes terminal density while maintaining a slim 12 mm profile. Integrated Distributed Clocks (DC) support ensures that measurements across the EtherCAT network are synchronized with a precision of << 1 µs, enabling high-speed deterministic control loops.

Technical Configuration (Deep Dive)

The EL3152 is built for both speed and signal purity. It offers a standard conversion time of ~60 µs, which can be accelerated to ~40 µs in "Fast Mode" for high-dynamic applications. To combat industrial electrical noise, the terminal features software-activatable FIR (Finite Impulse Response) and IIR (Infinite Impulse Response) filters.

For safety and reliability, the terminal includes limit value monitoring, allowing the PLC to trigger alarms or emergency stops if a signal exceeds or falls below predefined thresholds. The 500 V galvanic isolation between the signal level and the E-bus protects the internal controller logic from field-side voltage spikes. Furthermore, the unit is extensively certified for global use in hazardous environments with ATEX, IECEx, and cFMus approvals.

Technical Specifications

Technical FAQs

What is the benefit of "Single-Ended" technology in the EL3152?

Single-ended inputs use a common reference point for both channels. This allows Beckhoff to provide 2 high-resolution channels in a compact 12 mm width, which is highly efficient for cabinets where multiple 4–20 mA sensors share a common 24 V DC power source.

Can I monitor for a broken wire with this terminal?

Yes. Since the signal range is 4–20 mA, any current reading significantly below 4 mA (typically < 3 mA) can be interpreted by the PLC as a "Wire Break" or sensor fault, providing an inherent diagnostic advantage over 0–10 V systems.

Is this terminal suitable for use in North American hazardous zones?

Yes. With cFMus Class I, Division 2 certification, the EL3152 is approved for use in North American explosive atmospheres, as well as European Zone 2 areas via its ATEX and IECEx ratings.

Engineering & Installation Guide

• Wiring for Accuracy: For high-precision 16-bit measurements, use shielded twisted-pair cabling. The shield should be grounded to the functional earth (FE) via a shield bus or low-impedance clamp as close to the terminal as possible to minimize EMI interference.

• Filter Selection: Use the FIR filter for stable measurements in environments with high-frequency noise. Use the IIR filter if you require faster response times with a slight trade-off in noise suppression. These settings are easily adjusted via the TwinCAT "CoE - Online" tab.

• Thermal Planning: The EL3152 consumes approximately 170 mA from the E-bus. Ensure your Bus Coupler (e.g., EK1100) or power feed terminal provides sufficient current for the entire segment. Maintain vertical installation on the DIN rail to allow for natural convection cooling.

Engineering Advantages

The EL3152 is a premier choice for engineers seeking a balance between high-speed data acquisition and industrial-grade stability. Its 16-bit resolution ensures that even the smallest fluctuations in current are captured, while the 5 kHz limit frequency filter provides a clean signal for PID control loops. The inclusion of ES series pluggable wiring facilitates rapid maintenance and module replacement without re-wiring. For B2B machine builders, the EL3152 provides a robust, globally-certified analog interface that simplifies the bridge between field instrumentation and sophisticated EtherCAT-based control systems.