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KL6904

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The Beckhoff KL6904 is a 4-channel fail-safe output TwinSAFE terminal that combines high safety with flexible scalability, suitable for 24VDC low-power actuator control scenarios.
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Technical specifications for KL6904

  • Manufacturer:
    BECKHOFF
  • Part Number:
    KL6904
  • Product Family:
    BECKHOFF
  • Supply voltage:
    24 VDC (–15% / +20%)
  • Number of outputs:
    4
  • Max. output current:
    0.5 A/20 mA min. (per channel)
  • Protocol:
    TwinSAFE/Safety over EtherCAT
  • Cycle time:
    4…100 ms
  • Fault response time:
    ≤ watchdog time (parameterizable)
  • Current consumption K-bus:
    max. 250 mA
  • Power loss of the terminal:
    typically 2 W
  • Permissible ambient temperature (operation):
    0 °C to +55 °C
  • Permissible ambient temperature (transport/storage):
    -25 °C to +70 °C
  • Permissible air humidity:
    5% ... 95%, non-condensing
  • Protection rating:
    IP20
  • Safety standard:
    DIN EN ISO 13849-1:2008 (Cat. 4, PL e) and EN 61508:2010 (SIL 3)
  • Weight:
    0.1 kg
  • Estimated shipping dimensions:
    24x100x68cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.
Description
The Beckhoff KL6904 is a compact, fail-safe controller designed for safe digital output applications, allowing connection to actuators such as contactors and relays with a maximum current of 0.5 A at 24 VDC. It features 4 fail-safe outputs and adheres to international safety standards, including IEC 61508 SIL 3 and DIN EN ISO 13849-1 Cat. 4, PL e, ensuring high-integrity safety functions in industrial automation environments.

This TwinSAFE terminal integrates seamlessly with Beckhoff's Safety over EtherCAT system, providing robust, real-time communication and fast fault response. Its standard bus terminal design ensures compatibility with other Beckhoff Bus Terminals, making installation straightforward and flexible.

The KL6904 is optimized for energy-efficient operation, consuming a maximum of 250 mA via K-bus and typically 2 W power loss. It operates reliably in ambient temperatures from 0 °C to +55 °C, with storage and transport capability from -25 °C to +70 °C, and maintains safe operation in humid conditions (5–95% non-condensing). Its protection rating is IP20, suitable for installation inside control cabinets.

Designed for demanding industrial safety applications, the KL6904 provides configurable fault response times, short cycle times (4–100 ms), and supports secure integration into complex safety architectures, making it an ideal solution for small-scale safety control requirements.
Alternative Names
KI6904 KL6g04 KL69O4
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the supply voltage for the KL6904?
The KL6904 operates at 24 VDC with a tolerance of –15% to +20%.
Where is the KL6904 manufactured?
The KL6904 is made in Germany by Beckhoff.
How many outputs does the KL6904 have, and what is their current rating?
It has 4 fail-safe outputs, each capable of 0.5 A max. and 20 mA min.
Is the KL6904 brand new?
Yes, the KL6904 we supply is 100% brand new and comes in original packaging.
Which safety standards does the KL6904 comply with?
It meets IEC 61508:2010 SIL 3 and DIN EN ISO 13849-1:2006 Cat. 4, PL e.

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