KL1404 - Beckhoff Bus Terminal Digital Input

The Beckhoff KL1404 Bus Terminal Digital Input is engineered for accurate acquisition of digital signals in modern industrial automation. It provides four input channels using 2-wire connection technology and conforms to EN 61131-2 type 1/3 standards, making it highly compatible with industry-standard sensors. Operating at a 24 V DC nominal voltage, the module distinguishes between “0” signals from -3 to +5 V and “1” signals between 11 and 30 V. Each channel integrates a 3.0 ms input filter to minimize electrical noise, while the typical input current of 3 mA ensures stable operation. With a K-bus current consumption of only 3 mA, the KL1404 is energy-efficient even in large-scale I/O installations.

Compact and robust, the KL1404 is housed in a polycarbonate enclosure measuring 12 x 100 x 68 mm and weighing about 50 g. It mounts easily on a 35 mm DIN rail and supports side-by-side installation using Beckhoff’s double slot and key connection system. The module includes signal LEDs for quick and clear status indication of all input channels. Its wiring system accommodates solid, flexible, and ferrule conductors, simplifying installation and maintenance. With an IP20 protection rating, vibration and EMC compliance, and international certifications such as CE, UL, CCC, ATEX, IECEx, and DNV GL, the KL1404 offers long-term reliability for global automation standards.

In practice, the KL1404 Bus Terminal Digital Input is widely used in machine control systems, packaging automation, and building management, where reliable monitoring of switches, push buttons, and sensors is essential. Panel builders and OEMs benefit from its compact design and flexible wiring, while maintenance engineers appreciate the diagnostic LEDs and straightforward installation that reduce downtime. Engineering institutes and training centers also utilize the KL1404 to teach students hands-on skills in PLC integration and digital signal handling. With its trusted performance, international approvals, and ease of integration, the Beckhoff KL1404 remains a dependable choice for industries in India and worldwide seeking scalable Bus Terminal Digital Input solutions. For detailed specifications, request a callback or refer to the official Beckhoff product page.