EL4028 Beckhoff
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MPN: EL4028-0000
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The Beckhoff EL4028 is part of the EL EtherCAT Terminals series and features 8 analog outputs with 12-bit resolution. This terminal supports a 24 VDC power supply, E-Bus electronic supply, and has an IP20 protection class. It can be mounted on a 35 mm rail and allows for variable installation positions.
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Product Description:
The EL4028 is an eight-channel analog output EtherCAT terminal produced by Beckhoff and included in the EL EtherCAT Terminals series. Within an automation cell, the terminal serves as an interface between the high-speed EtherCAT fieldbus and voltage-driven actuators, providing scalable analog control without standalone I/O racks. By clipping onto the common DIN rail beside other terminals, it forms a compact signal layer that expands a controller’s analog output capacity while remaining fully synchronized with network timing. Suitable for machinery, process skids, and test stands, it supplies regulated voltages to command drives, valve amplifiers, or display instruments in distributed control architectures.
The terminal receives control-level power through a field supply of 24 V DC, while its internal logic draws energy from the EtherCAT E-Bus, eliminating separate power wiring for the electronics. Each of the 8 outputs is processed with a resolution of 12 bits, allowing the module to produce small, precise voltage changes. Protection is limited to IP20, so the device must be installed inside a control cabinet that prevents exposure to moisture, dust, and accidental contact. The terminal arrangement also allows additional EtherCAT modules to be installed beside it without requiring a separate I/O rack.
The module presents an eight-word, 16-bit analog output process image to the controller, allowing each conversion value to be written as a contiguous word during a bus cycle. The multiplex sampling method interleaves channel updates, while distributed-clock support keeps the analog signals aligned with EtherCAT timing. The outputs use a single-ended ground reference, simplifying wiring when all connected actuators share the same 0 V reference. Enhanced mechanical load resistance secures the housing to a 35 mm mounting rail in the control cabinet. Its variable installation position also supports dense terminal assemblies and accommodates different cabinet layouts without changing the electrical connections.
