Product Description:

The EL3314-0002 is a four-channel thermocouple input terminal manufactured by Beckhoff for the EL EtherCAT Terminals series. Intended for distributed control architectures, the module receives millivolt signals from Type K sensors and delivers digitally converted temperature values to the EtherCAT network. By combining cold-junction compensation, filtering, and A/D conversion in a 12 mm-wide IP20 housing, it streamlines cabinet layouts and supports precise temperature monitoring within automated machinery and process lines.

The measurement chain begins with an internal converter that offers a 24-bit native resolution, allowing very small voltage steps to be distinguished. Its input range of ±78 mV matches typical thermocouple outputs and helps prevent over-range errors, while a temperature display step of 0.01 °C/digit supplies finely graduated process data to the PLC. Cold-junction accuracy is held within ±1.75 °C, limiting overall temperature offset when the reference terminals deviate from 25 °C. For further granularity, the device resolves sensor voltage at 1 µV/digit, which supports stable readings even with longer sensor leads. Each input uses 2-wire connection technology and includes open-circuit recognition that flags broken or disconnected probes before incorrect control actions occur.

To protect the high-resolution signal chain, field wiring is galvanically separated from bus electronics by a barrier rated at 2.5 kV. System power is supplied through the backplane with an E-bus demand of only 200 mA, enabling multiple terminals to share a common EtherCAT segment. The compact enclosure meets the IP20 protection class, making it suitable for installation inside control cabinets where accessibility and convection cooling are required. A front-end analog filter with a cutoff frequency of 1 kHz attenuates noise and helps prevent aliasing, while the ±15 V differential limit on the input pins protects the circuitry against wiring errors and transient voltages.