The Beckhoff EL1859 is a versatile EtherCAT terminal that combines 8 digital inputs and 8 digital outputs in one compact housing, providing an efficient and space-saving solution for industrial automation systems. By integrating input and output channels in a single module, the EL1859 reduces cabinet space, wiring complexity, and overall system costs while maintaining Beckhoff’s hallmark performance and reliability.

The input channels are designed to meet EN 61131-2, type 1/3 specifications, ensuring compatibility with a wide range of industrial sensors, switches, and pushbuttons. With a typical input current of 3 mA (type 3), the module reliably acquires digital signals while minimising the load on connected devices. Each input incorporates a 3 ms input filter, which suppresses signal noise and bouncing, ensuring accurate and stable detection of state changes even in electrically noisy environments.

On the output side, the EL1859 provides 8 digital outputs, each capable of switching up to 0.5 A. The outputs are suitable for ohmic, inductive, and lamp loads, making them highly versatile for driving actuators, relays, signal lamps, or solenoids. Integrated short-circuit resistance and load management ensure long-term reliability, even under demanding conditions. With fast switching performance, the outputs support precise control of devices, contributing to higher system responsiveness and efficiency.

Operating at a nominal voltage of 24 V DC (-15%/+20%), the EL1859 aligns with industry standards, ensuring seamless integration into existing automation infrastructures. Its 1-wire connection technology simplifies wiring and reduces installation time, while the compact EtherCAT form factor makes it ideal for modular system expansion without requiring significant panel space.

As part of Beckhoff’s EtherCAT I/O system, the EL1859 benefits from high-speed, deterministic communication, enabling real-time signal acquisition and control. Engineers can configure, monitor, and diagnose the terminal easily through Beckhoff’s TwinCAT software, ensuring transparency and simplifying maintenance. Built-in diagnostics provide immediate feedback on I/O status, supporting fast troubleshooting and minimising downtime.

In practice, the EL1859 is well-suited to applications where both input and output points are required close to one another. This includes machine building, packaging systems, robotics, and building automation, where combining I/O channels in one terminal optimises panel design and reduces wiring complexity.

In summary, the Beckhoff EL1859 is a compact and efficient EtherCAT terminal with 8 digital inputs and 8 digital outputs. With its 24 V DC compatibility, noise-immune input filtering, versatile load switching capability, and seamless EtherCAT integration, it provides a powerful and flexible solution for decentralised automation. For engineers seeking to optimise cabinet space and simplify wiring without compromising performance, the EL1859 is an excellent choice.