Beckhoff KL6904 TwinSAFE Logic Bus Terminal

SKU KL6904

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12-month warranty
Free returns within 30 days

Manufacturer: BECKHOFF
Product No.: KL6904
Country of origin:Germany
Product Type: TwinSAFE Terminals
Payment: T/T, Western Union
Weight: 100g
Shipping port: Xiamen
Warranty: 12 months

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

Manufacturer	Beckhoff Automation
Part Number / Model	KL6904
Product Series	TwinSAFE / Bus Terminal
Connection Technology	2-wire
Number of Outputs	4 safe outputs
Maximum Output Current	0.5 A per channel (minimum 20 mA)
Protocol Support	TwinSAFE / Safety over EtherCAT (via K-bus coupling)
Cycle Time	4 ms to 100 ms (parameterizable)
Fault Response Time	Less than or equal to the parameterized watchdog time
Current Consumption (K-bus)	Max. 250 mA
Current Consumption (Power Contacts)	Load-dependent
Safety Standards Compliance	DIN EN ISO 13849-1:2008 (Cat. 4, PL e) and EN 61508:2010 (SIL 3)
Protection Rating	IP20
Ex Marking	II 3 G Ex nA IIC T4 Gc (ATEX Zone 2)
Installation Position	Horizontal
Weight	Approx. 100 g

Connections and Interfaces

Terminal Connection Point	Signal Allocation / Function
1	Safe Output 1
2	Safe Output 2
3	Safe Output 3
4	Safe Output 4
5	0 V DC (Reference Potential)
6	0 V DC (Reference Potential)
7	+24 V DC Power Supply Contact
8	0 V DC Power Supply Contact

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)

FAQ

What is the primary function of the Beckhoff KL6904?

The Beckhoff KL6904 is a TwinSAFE Logic Bus Terminal designed to serve as a safety-oriented controller, linking safe input signals to its 4 built-in safe outputs and running localized safety logic programs.

What is the maximum output current rating for the safe outputs on the KL6904?

Each of the 4 safe outputs on the KL6904 is rated for a maximum output current of 0.5 A, with a minimum current draw of 20 mA per channel.

Which safety standards does the KL6904 conform to?

The KL6904 is certified to meet DIN EN ISO 13849-1:2008 (Category 4, PL e) and EN 61508:2010 (SIL 3) standards.

Can the KL6904 be used in hazardous locations?

Yes, the KL6904 carries ATEX Zone 2 approval with the marking II 3 G Ex nA IIC T4 Gc.

What communication protocols are supported by the KL6904?

The module uses the TwinSAFE safety protocol over the Beckhoff K-bus structure to interface with other safety-relevant inputs and outputs.

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30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

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Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

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