EL3121 Beckhoff
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The Beckhoff EL3121 is part of the EL EtherCAT Terminals series and features one analog input with 16-bit resolution and a 5 kHz filter limit frequency. This module supports distributed clocks, has a differential ground reference, and mounts on a 35 mm rail. It operates with an input current capacity of 40 mA and has an IP20 protection class.
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Product Description:
The EL3121 is an analog input terminal manufactured by Beckhoff for the EL EtherCAT Terminals series. The unit captures low-level voltage signals from sensors and translates them into controller-readable values, thereby integrating measurement functions directly on the EtherCAT network. Designed for machine automation, it occupies only one slot on a 35 mm DIN rail and draws its logic supply from the internal E-bus, so no separate wiring is required for electronics power. This combination of compact packaging and networked acquisition streamlines distributed I/O installation on production equipment.
The terminal provides 1 differential input channel that accepts voltages up to a common-mode level of 10 V. An internal low-pass stage limits signal bandwidth to 5 kHz, reducing high-frequency noise before conversion. The front end draws up to 40 mA from the sensor circuit, and the measurement path has an input resistance of 85 Ω, which must be considered when driving high-impedance sources. Differential referencing suppresses ground loops, and the EtherCAT distributed-clocks feature lets the terminal time-stamp incoming samples so that multiple nodes remain phase-aligned across the network. Operating voltage for the electronics is supplied through the E-bus backplane, which simplifies cabinet wiring.
The housing snaps onto a 35 mm mounting rail and carries an IP20 protection rating that suits closed control enclosures. Each acquired sample is converted with 16-bit resolution and is placed in the process image as a 1 × 16-bit data word with an accompanying 1 × 8-bit status byte for diagnostics. Because conversion is simultaneous, time-critical channels in a system can be captured without inter-sample skew. The terminal can divert up to 100 mA of shield current to ground, limiting interference on incoming lines, and it exposes its process image cyclically through standard EtherCAT mapping.
Frequently Asked Questions about EL3121:
Q: How many analog input channels does the EL3121 terminal have?
A: The EL3121 terminal has one analog input channel for signal measurement.
Q: What is the analog input resolution of the EL3121?
A: The EL3121 offers a resolution of 16 bits, enabling high-precision signal acquisition.
Q: Does the EL3121 support distributed clocks for synchronized operation?
A: This terminal supports distributed clocks, enabling synchronized data acquisition with other EtherCAT devices.
Q: What is the input current capacity of the EL3121?
A: The input current capacity of the EL3121 terminal is rated at 40 mA.
Q: What mounting method and protection class apply to the EL3121 terminal?
A: Mounting for the EL3121 is done on a 35 mm rail, and the unit meets the IP20 protection class standard.
