EL3022 Beckhoff
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MPN: EL3022-0000
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The Beckhoff EL3022 is part of the EL EtherCAT Terminals series and features two analog inputs with 12-bit resolution. It supports a typical conversion time of 0.625 ms and has an IP20 protection rating. This terminal operates with a differential ground reference and a typical E-bus current of 130 mA.
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Product Description:
The EL3022 is an analog input terminal manufactured by Beckhoff for the EL EtherCAT Terminals series. It occupies a single 12 mm slice on a DIN rail and converts low-level differential sensor voltages into digital words that an EtherCAT controller can sample in the process image. Within an automation cell, the terminal allows distributed acquisition of field signals without routing long analog cables back to the control cabinet. Its compact housing conserves rail space while placing analog acquisition close to field devices.
The module provides 2 differential input channels, each sampled by a multiplexer followed by a 12-bit successive-approximation converter. Each channel has a conversion time of 0.625 ms, allowing fast feedback for motion or pressure loops. Communication and internal logic draw only 130 mA from the E-bus, minimizing the load on the upstream coupler. Inputs tolerate a common-mode potential of up to 10 V, so ground shifts between sensors and the terminal do not corrupt measurements when this limit is respected. The digital result has a resolution of 12 bits, producing 4,096 discrete codes across the full span for moderate signal granularity. Internally, each front-end path presents 85 Ω of resistance to the source, and all measurements are referenced in differential mode rather than to a single-ended ground.
An analog RC filter ahead of the converter has a cutoff frequency of 1 kHz, reducing high-frequency noise that may be present on unshielded wiring. Overall linearity is maintained within ±0.3% FSV, representing the maximum deviation of any code from the ideal transfer function. The housing carries an IP20 protection rating, indicating finger-safe access and suitability for installation inside control enclosures. In the cyclic EtherCAT frame, each channel uses a process image width of 2 bytes of status data and 2 bytes of value data, simplifying mapping to PLC variables. Sampling is performed in multiplex mode, so one converter handles both channels. The differential measurement arrangement helps suppress interference caused by voltage differences between field sensors and the local terminal reference.
