Beckhoff KL6904 TwinSAFE Logic Bus Terminal

Description

Integrated directly into decentralized control systems, the Beckhoff KL6904 TwinSAFE Logic Bus Terminal functions as an intelligent interface that establishes links between safe input and output signals. This safety-oriented terminal processes safety programs on-board, minimizing the overhead on the main control unit and optimizing localized response times. Utilizing the TwinSAFE protocol (Safety over EtherCAT/K-bus), the module manages localized safety functions and coordinate actions securely across standard K-bus communication structures.

The KL6904 is designed to operate seamlessly within Beckhoff's standard I/O environments, bridging physical safe inputs to its 4 built-in safe outputs. Certified for use in safety-critical sectors, this compact module provides a reliable mechanism to execute logic equations, monitor state conditions, and initiate fail-safe shutdowns within distributed industrial networks.

Features

• On-board processing of safety-relevant application logic.
• Supports up to 4 safe, potential-free semiconductor outputs.
• Seamless safety communication over standard K-bus pathways using TwinSAFE protocols.
• Parameterizable safety features including watchdog times and safety cycles (4 to 100 ms).
• Robust cross-circuit and short-circuit monitoring of outputs.
• Space-saving 12 mm terminal housing with integrated status LEDs.

Applications

• Distributed machinery safety networks.
• Emergency stop circuit evaluation and distribution.
• Light curtain and safety gate interlocking control.
• Automated materials handling and conveyor safety systems.

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Ensure all system power is disconnected prior to mounting or removing the terminal.
• Mount the module onto standard 35 mm DIN rails (EN 60715), pushing until the locking latch clicks firmly into place.
• Maintain a horizontal mounting orientation to allow optimal passive convection cooling through the terminal vents.
• Ensure grounding integrity is maintained via the integrated grounding contact point on the DIN rail.

Compliance and Certifications

• CE
• UL / cULus
• ATEX: II 3 G Ex nA IIC T4 Gc
• DIN EN ISO 13849-1:2008 (Category 4, PL e)
• EN 61508:2010 (SIL 3)