Description

The BECKHOFF BK2020 is a dedicated Lightbus Bus Coupler designed to connect the Lightbus fieldbus system to modular BECKHOFF Bus Terminals. The coupler acts as a decentralized gateway, converting physical optical signals from the Lightbus ring into the internal K-bus protocol used by the connected I/O terminals. It manages process data exchange and provides diagnostic functions for the local terminal assembly.

The BECKHOFF BK2020 supports standard K-bus terminals, accommodating a direct connection of up to 64 modules. With a K-bus extension system, the configuration can expand to support up to 255 Bus Terminals. The integrated optical fiber interface offers excellent immunity to electromagnetic interference, ensuring stable, high-speed communication over varying physical distances.

For system deployment, the coupler includes an integrated power supply unit. This unit draws from a 24 V DC source to supply power to both the internal coupler and K-bus electronics, while also feeding the integrated power contacts to distribute 24 V DC power to the field-side terminal electronics.

Features

• Direct connection interface for up to 64 BECKHOFF Bus Terminals, expandable to 255 with K-bus extension.
• Lightbus fiber optic communication interface with dual standard optical connectors.
• High noise immunity due to optical fiber transmission line.
• Integrated power supply unit providing up to 1750 mA current supply for connected K-bus terminals.
• Built-in 24 V DC power contacts for local power distribution to field-side terminals.
• Configuration and diagnostics supported via KS2000 software or directly through the master controller.

Applications

• Decentralized industrial automation systems requiring high electromagnetic compatibility (EMC).
• Machine control architectures utilizing the Lightbus fiber optic communication ring.
• Distributed I/O processing where electrical isolation and noise rejection are critical.

Technical Specifications

General

Electrical Data

Fieldbus and Communication

Physical and Environmental

Installation Guidelines

1. Ensure all electrical power supplies are de-energized before beginning installation or maintenance tasks.
2. Mount the coupler onto a standard 35 mm DIN rail (EN 60715) by snapping it firmly into place.
3. Slide the required Bus Terminals onto the DIN rail from the right side, making sure they engage securely with the K-bus contacts of the coupler.
4. Connect the incoming and outgoing Lightbus fiber optic cables to the dual optical connectors, ensuring clean fiber ends and correct bend radiuses.
5. Connect the 24 V DC power source to the terminal connection points for both the coupler electronics and the power contacts.
6. Verify that the ground (PE) connection is properly established to maintain EMC compliance.

Replacement Recommendations

When replacing an existing BECKHOFF BK2020, document the physical arrangement of all connected Bus Terminals and record configuration settings before removal. Power down the system completely. Disconnect all wiring and fiber optic cables, paying special attention to transmitter and receiver fiber assignments. Release the coupler from the DIN rail, slide the new unit into place, reattach the terminal block, and restore the electrical and optical connections. Re-apply power and verify proper optical ring status and K-bus communication indicators.