Beckhoff KL6831 Bus Terminal

Description

Directly integrating Standard Motor Interface drives into the modular K-bus terminal system, the Beckhoff KL6831 enables high-precision coordination of up to 16 SMI LoVo actuators. This single-channel terminal serves as a dedicated communication gateway, facilitating bilateral data transfer between the control processor and intelligent roller shutter or solar protection drives. Operating on the low-voltage SMI LoVo physical layer, the Beckhoff KL6831 minimizes system wiring overhead and bridges the field level directly to the controller process image using 24-byte input and output maps. Additionally, the integration of local hardware inputs permits commissioning sequences prior to network software configuration.

Features

• Supports connection of up to 16 SMI LoVo (Low Voltage 24 V DC) actuator slaves.
• Features two integrated 24 V DC digital inputs on the terminal body for simplified local commissioning and manual testing.
• Provides galvanic isolation up to 1500 V DC between the SMI bus and the internal K-bus.
• Implements continuous diagnostic monitoring of motor state feedback via the TwinCAT PLC SMI library.
• Supports flexible line topologies extending up to a maximum aggregate cable distance of 200 meters.

Applications

• Automated solar shading, louver control, and blind adjustment in high-exposure commercial facades.
• Industrial cleanroom shading systems utilizing 24 V DC Low Voltage motors.
• Integration of automated window and ventilation actuators in building management networks.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The KL6831 is specifically built for 24 V DC SMI LoVo standard actuators. If your installation utilizes standard line-voltage (230 V AC) SMI actuators, you must deploy the alternative KL6832 module to prevent irreversible hardware damage. Both terminals share the same TwinCAT PLC library blocks, allowing straightforward porting of PLC application code between 24 V and 230 V architectures.

Application Pitfalls & Engineering Notes

While the theoretical SMI bus limit is 200 meters, signal integrity degrades in high-EMI environments when run parallel to medium-voltage power lines. Always route the SMI communication pairs in shielded, twisted-pair cables. To avoid voltage dropouts across LoVo lines, recalculate the supply wire cross-section based on the cumulative peak inrush currents of all 16 connected drives during simultaneous startup cycles.

Commissioning & Wiring Tips

The integrated digital inputs 1 and 2 allow commissioning personnel to drive the SMI actuators up and down directly at the terminal strip before configuring the TwinCAT software or mapping the bus coupler. This minimizes on-site commissioning timelines by isolating physical wiring faults from PLC code issues. Ensure the 24 V DC power contacts are correctly linked via the adjacent terminal power feed-in points.

Installation Guidelines