EL4021 Beckhoff
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MPN: EL4021-0000
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The Beckhoff EL4021 is a single output terminal from the EL EtherCAT Terminals series. It operates with a 24 V DC power supply and delivers a signal current range of 4 to 20 mA with a 12-bit resolution. The terminal is short-circuit proof with a load resistance of less than 500 Ohms and has a protection rating of IP20.
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Product Description:
The EL4021 is an analog output EtherCAT terminal manufactured by Beckhoff for the EL EtherCAT Terminals series. Acting as a single-channel current source, it connects directly to a bus segment to drive process transmitters or control valves with a regulated current loop. Within an automation cell, the terminal converts digital setpoints from the controller into a proportional current, allowing distributed I/O islands to execute precise actuator commands without separate signal conditioners. Its compact terminal format also allows the output channel to be positioned close to the connected field device, reducing the amount of analog wiring required inside the control system.
The terminal is energized through the power contacts at 24 V DC, a supply level commonly used in control cabinets, so no additional voltage conversion is required. Its output range spans 4–20 mA, providing an industrial current-loop signal that resists the effects of voltage drops and electrical noise over long cable runs. Internal conversion is handled by a 12-bit digital-to-analog converter, delivering 4,096 discrete steps and a resolution of approximately 4.9 µA per count. Typical power-contact consumption is 50 mA, keeping the total load on the 24 V bus modest when multiple terminals are connected in sequence. A load resistance of less than 500 Ω is permitted. Short-circuit monitoring allows the channel to respond safely if an output fault occurs.
The communication electronics draw approximately 140 mA from the EtherCAT E-bus, and this demand must be included when sizing the backplane supply provided by the upstream coupler. The module provides one galvanically isolated output, allowing the channel to operate with electrical separation from other parts of the control system. Its IP20 housing protects the circuitry against access by fingers but does not provide protection against water. The enclosure is intended for installation inside a suitable control cabinet where exposure to moisture and excessive contamination is restricted. Mechanical dimensions and terminal connections are consistent with other EL terminals, allowing the module to fit into mixed EtherCAT I/O assemblies. Diagnostic behavior is integrated into the EtherCAT system so the controller can monitor terminal and channel status during operation.
