EL4104 by Beckhoff

The EL4104 analog output terminal is produced by Beckhoff within the EL EtherCAT Terminals series. Intended for controllers that must generate precise voltages, the module converts digital process data from the fieldbus into four independent single-ended signals for actuators, proportional valves, or measurement equipment. Mounted directly on a DIN rail, it forms part of a modular I/O stack that streamlines distributed automation architectures and removes the need for separate analog interface boards.

Each channel delivers a maximum output update rate of 4 kSps, so fast control loops receive new analog values every 250 µs. Signal quality is supported by a native resolution of 16 bits including sign, allowing tight scaling across the full output span. The terminal occupies 4 × 16-bit data in the process image, simplifying address mapping in a PLC. The output stages support loads higher than 5 k?, which prevents excessive current draw on sensitive instrumentation. The electronics draw only 190 mA from the E-bus, keeping power requirements predictable within compact cabinets.

A single-ended ground reference means all channels share the same common connection, reducing cabling but requiring attention to ground loops. Installation remains flexible because the housing can be placed in any orientation on a standard 35 mm mounting rail, and the device retains full functionality in each position. The output stage is short-circuit-proof, and the housing carries a protection rating of IP20, guarding against accidental contact. The logic and output sections receive their power solely through the E-bus, eliminating the need for extra supply terminals. Integrated Distributed Clocks with simultaneous sampling keep channel-to-channel timing differences to a minimum, ensuring coherent signal generation even when many EtherCAT nodes are connected in sequence.