ELM3704-0000 Beckhoff
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The Beckhoff ELM3704-0000 is part of the ELM EtherCAT Terminals series and features four differential analog input channels with a maximum voltage range of ±60 V and a current range up to ±20 mA. This terminal uses a 24-bit delta-sigma ADC, offers a sampling rate of 10 ksps, and has an IP20 protection class. The device supports an internal sample rate of 8 Msps and a maximum resistance range of 5 kiloohms.
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Product Description:
The ELM3704-0000 is an analog measurement terminal produced by Beckhoff within the ELM EtherCAT Terminals series. Designed for machine and process automation, the unit serves as a precise data-acquisition front end that converts sensor voltage, current, or resistance signals into bus-synchronous digital words for the controller layer. By housing signal conditioning directly on the EtherCAT backplane, it shortens wiring paths and simplifies distributed I/O architectures. With four differential input channels, it targets vibration analysis, strain measurement, and general-purpose monitoring tasks that demand high-fidelity acquisition. This arrangement is useful when multiple sensor signals must be captured at the same instant and transferred to the controller without separate signal conditioners.
Internally, a delta-sigma conversion chain handles the four differential channels. The terminal resolves input data to 24-bit resolution, allowing detection of small amplitude changes even across its wide ±60 V span. A maximum programmable rate of 10 ksps per channel is derived from an 8 Msps oversampling clock, so digital filtering suppresses quantization noise before values reach the network. When operating in current mode, the input accepts up to ±20 mA, and resistance measurement is possible to 5 kΩ without external shunts. The module draws 890 mA of E-bus current during full-speed acquisition. Sixty-eight selectable measuring ranges let each channel be matched to its sensor, while a 2 mA IEPE bias current powers piezoelectric accelerometers. After every range change, the filter settles within 300 µs, limiting dead time in adaptive test rigs.
A hardware low-pass stage fixed at 30 kHz removes radio-frequency interference before conversion, preventing front-end overload. Downstream, the digital low-pass response features a corner at 2.6 kHz, yielding flat passband characteristics for most control applications while attenuating out-of-band energy that could alias into the data stream. Thermal dissipation is limited to 3 W, so enclosure airflow requirements remain moderate. With an IP20 housing, the module integrates cleanly into switchgear cabinets where high-resolution, multi-range analog acquisition is needed.
