Product Description:

The EL4002 is an analog output EtherCAT terminal manufactured by Beckhoff within the EL EtherCAT Terminals series. Designed for distributed control systems, the module converts digital setpoints from a PLC into regulated voltage signals that drive actuators, control valves, or speed references on inverters. By occupying a single slot on the EtherCAT I/O strand, it extends the fieldbus with deterministic analog functionality without requiring a separate remote station. Its compact footprint minimizes cabinet space in new or retrofit machines.

In operation, the terminal has two independent channels that produce a programmable output of 0 to 10 V referenced to a single-ended ground. Each channel provides 12-bit resolution, and internal calibration limits linearity and offset so that the total output error remains within less than ±0.1% of full scale. The design requires a load impedance of more than 5 kΩ, avoiding excessive current draw from the outputs. Output sampling is handled by a multiplex circuit that sequentially updates the channels; the data appear to the EtherCAT master as a 2 × 16-bit analog output process image. Support for distributed clocks lets the EL4002 maintain nanosecond-level alignment with other terminals in synchronized motion or measurement tasks.

Power for the EL4002 comes from the system’s 24 V DC supply, with the electronics fed directly through the EtherCAT E-bus. During normal operation, the module draws a typical E-bus current of 140 mA, while the power contacts forward a typical 40 mA to the field side. The shared 0 V line can carry up to 500 mA, providing adequate return capacity for both outputs. The electronics receive their entire supply through the E-bus, so no additional supply wiring is required. The housing meets the IP20 protection class, so installation is limited to enclosed control cabinets that provide basic protection against accidental contact.