BECKHOFF KL6841 Bus Terminal

Description

The BECKHOFF KL6841 Bus Terminal is a specialized SMI (Standard Motor Interface) master terminal designed for integration into Beckhoff K-bus modular I/O systems. This single-channel terminal enables the direct connection and control of up to 16 SMI slaves, such as shutter and blind drives, via a standard two-wire line topology. Operating as a dedicated communication interface, the device manages data exchange at a transfer rate of 2400 baud over cable lengths of up to 200 meters, allowing precise positioning and status monitoring within building automation and industrial shading applications.

The terminal features integrated power management for the connected field devices, supporting an SMI system voltage of 230 V AC and a nominal input voltage of 24 V DC for internal electronics. Additionally, the KL6841 includes two onboard digital inputs intended to facilitate simplified local commissioning and manual override functions. Integration into the control system is handled via the higher-level Bus Coupler or controller, utilizing the dedicated TwinCAT PLC SMI library for streamlined engineering and parameterization.

Features

• Single-channel SMI master interface for up to 16 Standard Motor Interface slaves
• Supports line topology with a maximum cable length of 200 meters at 2400 baud
• Integrated SMI system supply at 230 V AC for connected drives
• Equipped with 2 digital inputs for simplified local commissioning
• Process image bit width of 24 bytes for input and output data exchange
• Robust electrical isolation between the SMI bus, K-bus, and power contacts
• Configurable via the higher-level Bus Coupler or controller using TwinCAT PLC libraries

Applications

• Building automation and commercial real estate management
• Centralized and decentralized control of motorized blinds, roller shutters, and sun protection systems
• Energy-efficient facade automation integrated into Beckhoff control architectures

Technical Specifications

General

Signal and I/O

Electrical and Communication

Mechanical and Environmental

Installation Guidelines

1. Ensure the entire control system is de-energized and locked out before beginning installation or wiring work.
2. Inspect the BECKHOFF KL6841 Bus Terminal and its housing for any signs of transport damage.
3. Mount the terminal onto the 35 mm DIN rail adjacent to the appropriate Bus Coupler or existing K-bus terminals, ensuring a secure mechanical lock.
4. Verify that the K-bus connections and power contacts interlock correctly with neighboring modules.
5. Connect the SMI line topology and field power supplies in accordance with the application wiring requirements, maintaining proper shielding and separation between low-voltage control circuits and the 230 V AC SMI network.
6. Apply system power and verify operation using the diagnostic indicators and the TwinCAT software environment.