KL1704 - Beckhoff Bus Terminal Digital Input

The Beckhoff KL1704 Bus Terminal Digital Input is built for dependable signal acquisition in industrial automation systems that require monitoring of AC inputs. It supports 2-wire connection technology and provides four input channels, each designed to operate with 120/230 V AC nominal voltage. The terminal detects “0” signals up to 40 V and “1” signals from 79 to 260 V, ensuring accurate switching across a wide range of AC applications. An integrated 10 ms input filter enhances stability by reducing noise and transient disturbances. Current consumption per channel is typically 4.6 mA at 230 V and 2.3 mA at 120 V, while the K-bus current draw is just 3 mA, making it efficient for large control setups.

Compact and durable, the KL1704 is housed in a strong polycarbonate body measuring 12 x 100 x 68 mm and weighs about 60 g. The unit mounts securely on a 35 mm DIN rail with Beckhoff’s locking mechanism and allows side-by-side installation through its double slot and key connection. It includes signal LEDs for each channel, offering clear real-time monitoring of input status. The terminal supports solid, flexible, and ferrule wiring types with spring-actuated connections, making installation straightforward. With an IP20 protection rating and certifications such as CE and UL, the KL1704 is globally recognized for safety and reliability. Compliance with EMC and vibration resistance standards ensures consistent performance in demanding environments.

In practice, the KL1704 Bus Terminal Digital Input is ideal for monitoring switches, sensors, and contactors in AC-powered systems. It is widely used in building automation, machine tools, and process industries where precise input detection is critical. OEMs and panel builders appreciate its compact size and ease of wiring, while maintenance engineers benefit from its diagnostic LEDs and robust construction, which reduce downtime. Engineering institutes and training centers also adopt this module to give students hands-on experience with AC digital input handling and PLC integration. With its strong certifications, stable design, and field-proven performance, the Beckhoff KL1704 is a trusted choice for industries across India and worldwide seeking dependable Bus Terminal Digital Input solutions. For detailed product specifications and support, request a callback or refer to the official Beckhoff product page.