The Beckhoff KL3022 Bus Terminal is a versatile analog input module designed for the acquisition of current signals in the widely used 4…20 mA standard. With two differential input channels, it provides a compact and reliable solution for integrating process signals from sensors and transmitters directly into distributed automation systems.

The use of differential measurement technology ensures high signal integrity and robust performance, even in electrically noisy industrial environments. By eliminating common-mode interference, the KL3022 enables precise acquisition of process values such as temperature, pressure, flow, or level from standard industrial transmitters. With a maximum common-mode voltage (UCM) of 35 V, the terminal can tolerate challenging electrical conditions, further improving reliability in field applications.

Each channel has an internal resistance of 80 Ω plus 0.7 V diode voltage, designed to ensure compatibility with current loop sensors while maintaining stable and accurate measurements. The module achieves a conversion time of approximately 2 ms, allowing it to capture process signals responsively without compromising accuracy. With 12-bit resolution, it offers sufficient precision for typical automation tasks where 4…20 mA loops are the industry norm.

Power for the KL3022 is supplied via the K-bus, which distributes both power and communication across Beckhoff’s modular I/O platform. This simplifies installation and eliminates the need for external wiring of the terminal’s electronics. Its compact, modular design enables the KL3022 to be seamlessly combined with digital, analog, or specialty terminals, making it easy to tailor I/O configurations to specific application requirements.

Practical applications for the KL3022 span across a wide range of industries. In process automation, it can acquire 4…20 mA signals from pressure transmitters, flow sensors, or temperature converters. In machine automation, it can capture signals from monitoring devices or condition sensors. In building technology, it can be used for integrating HVAC or energy management sensors into central control systems. Its ability to acquire two independent channels in one module makes it an efficient choice for compact installations.

Engineers benefit from simplified wiring and reduced cabinet space compared to external analog input devices, while operators gain reliable monitoring of key process values. By leveraging Beckhoff’s modular I/O approach, the KL3022 helps streamline system design and reduces engineering costs while ensuring long-term reliability.

In summary, the Beckhoff KL3022 Bus Terminal provides a dependable and efficient solution for acquiring 4…20 mA signals in industrial and process environments. With dual differential inputs, robust noise immunity, fast conversion time, and seamless integration into the Bus Terminal system, it offers a compact and flexible platform for accurate process signal acquisition in modern automation architectures