EL2022 by Beckhoff

The EL2022 is a twin-channel digital output terminal from Beckhoff that belongs to the EL EtherCAT Terminals series. Within an EtherCAT segment it acts as a compact actuator interface, forwarding controller commands to field devices that run on 24-volt logic or power. By converting the system's serial process data into two discrete high-side switches, it streamlines distribution of switching tasks for machinery, conveyors, and building automation systems.

Each output delivers a nominal level of 24 VDC and can source up to 2 A per channel, enough to drive contactors, solenoids, or indicator lamps without an intermediate relay. Typical activation latency is only 40 µs, while de-energizing takes about 200 µs; these timing figures help maintain deterministic cycle times in fast PLC programs. Terminal electronics obtain bus power through the internal E-bus, drawing a typical 100 mA. Two independent outputs share the same supply yet remain electrically separated in the process image, so the controller addresses them as bit-wide variables. The design supports ohmic, inductive, and lamp loads, and it integrates reverse-voltage and short-circuit protection to avoid damage from wiring errors or stalled actuators.

For cabinet integration the terminal snaps onto a 35 mm DIN rail, and its installation position is variable, allowing horizontal or vertical mounting without affecting heat dissipation. Housing and spring terminals are rated to the IP20 protection class, keeping fingers and tools away from live conductors while remaining suited for clean, enclosed panels. When inductive loads are disconnected, the internal suppression circuitry limits switch-off energy to less than 1.7 J per channel, reducing arcing on the power path. In the EtherCAT memory map the device occupies exactly 2 output bits, so no word alignment overhead is introduced when grouping multiple EL2022 units on the same node.