EL4018 Beckhoff
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MPN: EL4018-0000
The Beckhoff EL4018 is part of the EL EtherCAT Terminals series and provides eight analog outputs with 12-bit resolution. It is designed for single-ended ground reference, features a measuring error less than ±0.1% FSV between 0 and 55°C, and operates on a 24 VDC power supply with a mounting rail size of 35 mm. The terminal supports IP20 protection class and uses the E-bus for electronics supply.
Internal Product Review
The EL4018 is a Beckhoff EtherCAT analog output terminal with 8 outputs and 12-bit resolution. Single-ended signaling and multiplex sampling support clean analog control and dependable channel handling in EtherCAT I/O systems. Distributed clocks precision below 100 ns makes this terminal a strong choice for accurate, synchronized automation tasks.
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Product Description:
The EL4018 is an analog output EtherCAT terminal produced by Beckhoff and included in the EL EtherCAT Terminals series. Designed for EtherCAT I/O stations, this eight-channel module generates precise voltage levels that drive actuators, signal conditioners, and measurement devices inside automated machinery. By inserting the terminal onto the DIN rail beside other EL family units, the system can expand the controller’s process image without external wiring blocks and keep all field data on the high-speed EtherCAT backplane.
Each output is converted with 12-bit resolution, so the module delivers 4,096 discrete voltage steps over its range. Within the PLC mapping, the terminal occupies 8 × 16-bit analog output words, allowing simultaneous command words and status feedback for every channel. Timing synchronization with neighboring nodes is maintained by EtherCAT Distributed Clocks, and the EL4018 holds jitter below 100 ns, supporting deterministic motion profiles. Sampling follows a multiplexed scheme that sequentially updates the eight channels while sharing internal converters. The outputs share a single-ended ground reference, and their linearity remains within a measurement error of ±0.1% of full scale between 0 °C and 55 °C. Operating power is supplied by the system’s 24 VDC line, while a dedicated power contact delivers 50 mA to downstream terminals.
The electronics draw 100 mA from the internal E-bus, and signal-switching energy passes through the same backplane, so no additional wiring is required. Channel loading is limited to less than 150 Ω, keeping the output stages within their compliance voltage. The terminal has an IP20 protection rating, which protects against contact with hazardous internal components and solid objects larger than 12.5 mm. It clips onto a 35 mm top-hat rail and relies on the E-bus as its single electronics supply path. The compact housing fits decentralized analog output stations in equipment that uses a single-ended reference across multiple modules.
