ELM3348-0003 Beckhoff
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The Beckhoff ELM3348-0003 is part of the ELM EtherCAT Terminals series and features eight differential analog input channels with 24-bit resolution and a 1 ksps sampling rate. The module provides channel-to-e-bus isolation at 707 V DC and supports a maximum input voltage of ±12.5 V. It uses a mini-TC universal connector with 2-wire connection technology and offers cold junction accuracy of ±0.4 °C.
Internal Product Review
The ELM3348-0003 is a Beckhoff EtherCAT thermocouple input terminal with 8 differential analog inputs and Mini-TC Universal connectivity. 24-bit resolution and ±0.4 °C cold junction accuracy support precise, stable temperature acquisition in demanding measurement tasks. A strong choice for high-integrity thermal monitoring, especially with 707 V DC channel-to-E-bus isolation.
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Product Description:
The ELM3348-0003 is an analog input terminal produced by Beckhoff for the ELM EtherCAT Terminals series. As an eight-channel differential module, it couples directly to thermocouples through Mini-TC Universal connectors and forwards high-accuracy temperature data to an EtherCAT network. In automated plants, the terminal fits into a DIN-rail I/O segment, where it supplies rapid, isolated temperature feedback for process control loops and condition monitoring.
An internal converter samples each channel at 8 Msps; a digital filter with a cutoff frequency of 10.9 kHz suppresses out-of-band noise before the data are reduced to the 1 ksps rate presented on the EtherCAT bus. Signal integrity is protected by 707 V DC isolation between the field side and the E-bus. The field front end tolerates up to ±12.5 V without damage, while a 24-bit ADC quantizes the measured range, providing fine resolution for the small millivolt outputs of thermocouples. The analog path is limited to 330 Hz, matching the dynamics of temperature processes, and wiring uses a two-wire technique that minimizes space in the control cabinet. Total internal losses stay below 2 W, so the module can be mounted in dense terminal stacks without extra cooling.
The E-bus draws 260 mA, a value that must be included in the power budget when multiple terminals share the same power segment. A built-in cold-junction sensor achieves an accuracy of ±0.4 °C, with 25 mK repeatability and a temperature coefficient of 7.5 mK/K, ensuring stable offset compensation across ambient temperature changes. Converted temperatures are delivered with a native resolution of 0.001 °C, allowing the controller to detect minute deviations in heaters, heat exchangers, or environmental chambers without additional signal conditioning.
