Product Description:

The EL3174-0090 is an analog input terminal manufactured by Beckhoff for the EL EtherCAT Terminals series. It installs on a standard EtherCAT rail and converts field-level voltage or current signals into digital data that a controller can log or regulate. By offering isolated measurement channels and integrated conversion electronics, the terminal supports compact, high-speed data acquisition in distributed automation cells without separate analog boards.

This model provides 4 analog inputs that are sampled by a SAR converter in multiplex sequence, so each channel is read in turn. Users gain precise numeric values because the converter delivers 16 bit resolution, giving 65,536 quantization steps across the measurement span. A built-in 5 kHz input filter suppresses high-frequency noise before conversion, while the 107% extended range allows the module to detect slight overrange excursions without clipping. The common-mode voltage limit of 35 V protects the circuitry against potential differences between sensors, and the terminal uses differential voltage measurement and single-ended current measurement. Cycle times down to a 200 µs minimum EtherCAT cycle keep control loops fast, while <1 µs distributed clock precision aligns the terminal’s sampling points with system-wide timing.

Power for the bus interface is drawn from the EtherCAT backplane and amounts to 170 mA E-bus current, which helps when sizing the total segment supply. Each input path includes 50 mA overcurrent protection that disconnects the channel if a wiring fault creates excessive load. For current-mode measurements, the terminal uses an 85 Ω input resistance in current mode, which minimizes voltage drop through shunt sensing. In voltage mode, it presents >200 kΩ input resistance in voltage mode to avoid loading delicate sensor outputs. The enclosure measures 15 × 100 × 70 mm, so the narrow housing conserves cabinet space while preserving the terminal’s multiplex sampling behavior and SAR accuracy.