BECKHOFF BK3120 Used Working Bus Terminals Bus Coupler

Product Overview

The Beckhoff BK3120 is a highly efficient PROFIBUS DP "Economy Plus" Bus Coupler designed to connect modular Beckhoff Bus Terminals (KL/KS series) to PROFIBUS DP networks. This module acts as a gateway, allowing up to 64 Bus Terminals (expandable to 255 via K-bus extension) to communicate with a master PLC or PC at high speeds. With automatic baud rate detection up to 12 Mbaud and support for DPV1 services, the BK3120 is a staple for distributed I/O systems in manufacturing, packaging, and process automation where reliability and high-speed data exchange are critical.

Key Features

• High-Speed PROFIBUS DP: Supports the widely used PROFIBUS DP protocol with automatic baud rate detection from 9.6 kbaud up to 12 Mbaud.
• Massive Scalability: Standard support for 64 terminals, with the ability to handle up to 255 spatially distributed terminals using K-bus extension technology.
• DPV1 Services Support: Enables direct access to the coupler registers and complex terminals for advanced parameterization and limit-value settings.
• High Data Capacity: Capable of transferring up to 128 bytes of input and 128 bytes of output data per cycle.
• Diagnostic LEDs: Equipped with front-panel status indicators for "Power," "K-Bus," and "Bus Error" for immediate local troubleshooting.
• Robust Isolation: Features 500V electrical isolation between the power contacts, supply voltage, and the fieldbus for enhanced system safety.
• Compact Design: Slim 51mm width saves valuable DIN rail space in industrial control cabinets.

Item Condition (Used - Working)

• Functional Status: Used - Working. This coupler has been professionally decommissioned from a functional PROFIBUS network. It has been tested for power-up and successful K-bus communication with attached KL-series terminals.
• Physical State: Excellent industrial condition. The plastic housing is free of cracks, and the address selection switches click firmly. The side-mounted gold K-bus contacts are clean and straight.
• Technical Integrity: The 9-pin D-sub interface is in perfect condition, ensuring a secure and noise-free fieldbus connection.
• Visual Reference: Please refer to the high-resolution images to verify the specific hardware version; the unit pictured is the exact Beckhoff BK3120 you will receive.

Package Includes

1. 1 x Beckhoff BK3120 PROFIBUS "Economy Plus" Bus Coupler (Used)
2. Note: Does not include the KL9010 end terminal, Bus Terminals (KL/KS), or PROFIBUS cables/connectors.