Beckhoff EL3114 EtherCAT Terminal 4-channel Analog Input Module

Description

Acquisition of high-precision analog signals within synchronized automation environments is handled directly by the Beckhoff EL3114, an EtherCAT terminal delivering four independently isolated differential current measurement channels spanning 0 to 20 mA. Operating with a high-fidelity 16-bit resolution, this industrial terminal converts current loop values into clean process data for the EtherCAT controller. Equipped with high-speed hardware capabilities, it supports Distributed Clocks (DC) with a synchronization accuracy of under 1 microsecond, making it ideal for fast, time-aligned loop measurements across multi-node automation architectures.

Features

• Four independent, differential analog inputs designed to minimize ground loop interference.
• Precise 16-bit analog-to-digital conversion process (including sign representation).
• Integrated hardware synchronization via EtherCAT Distributed Clocks (DC) with synchronization deviation below 1 microsecond.
• Built-in 5 kHz hardware input filter to reject high-frequency mechanical and electromagnetic noise.
• Robust electrical isolation of 500 V (RMS) between the internal E-bus control logic and field signals.
• Compact 12 mm housing width maximizing density inside standard control panels.

Applications

• Industrial process control networks monitoring standard 0 to 20 mA current loops.
• Distributed data acquisition systems requiring microsecond-level synchronization.
• Closed-loop feedback systems in assembly, packaging, and high-speed material handling.
• Power and current tracking installations across sub-distribution enclosures.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The EL3114 can directly replace legacy EL311x models if process software mappings are verified. Systems switching from non-DC terminals to the EL3114 should ensure that Distributed Clock synchronization is enabled in the TwinCAT active configuration to prevent time-base drift. Ensure the ES3114 variant is selected if pluggable terminal connector modules are preferred for on-site swapping.

Application Pitfalls & Engineering Notes

The internal differential input path relies on standard operational amplifiers with a absolute maximum common-mode voltage limit of 10 V. Exceeding this boundary across channels will result in severe measurement clamping and non-linearities. Additionally, because this terminal draws a continuous 130 mA from the internal E-bus connection, system integration planners must verify the total current output profile of the preceding Bus Coupler (such as an EK1100) and insert intermediate power supply terminals (EK1110 / EL9400) if the cumulative E-bus budget is exceeded.

Commissioning & Wiring Tips

To protect sensitive low-amplitude signal transmissions, always route current loops with shielded twisted-pair cabling. Ground the shield at the cabinet entry or terminal bracket. Filtering parameters (such as the IIR/FIR low-pass behavior) are completely adjustable in the TwinCAT Software via the CoE (CAN over EtherCAT) parameter objects 0x80n0, allowing the 5 kHz hardware filter to be fine-tuned to isolate mechanical vibrational noise patterns.

Installation Guidelines