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KL2904

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The Beckhoff KL2904 is a 4-channel TwinSAFE safety digital output terminal block suitable for demanding industrial safety scenarios, combining high reliability with standardized integration.
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Technical specifications for KL2904

  • Manufacturer:
    BECKHOFF
  • Part Number:
    KL2904
  • Product Family:
    BECKHOFF
  • Number of inputs/outputs:
    0/4
  • Status display:
    4 (one green LED per output)
  • Fault reaction time:
    ≤ watchdog times
  • Output current per channel:
    max. 500 mA, min. 20 mA
  • Cable length between sensor and terminal:
    unshielded max. 100 m, shielded max. 100 m
  • Input/Output process image:
    6 bytes
  • KL2904 supply voltage:
    24 VDC (–15% / +20%)
  • Current consumption via K-bus:
    maximum 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
  • Permissible air pressure (operation/storage/transport):
    750 hPa ... 1100 hPa
  • Shocks:
    15 g with pulse duration 11 ms in all three axes
  • Protection rating:
    IP20
  • Approvals:
    CE
  • Weight:
    0.1 kg
  • Estimated shipping dimensions:
    2.4x10x6.8cm
  • 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 KL2904 is a safe digital output terminal designed for connecting actuators such as contactors and relays in industrial automation systems. It features four fail-safe outputs with a maximum current of 0.5 A per channel (24 V DC), making it ideal for implementing safety-critical applications.

The terminal complies with international safety standards, including IEC 61508 SIL 3, DIN EN ISO 13849-1 (Cat 4, PL e), NRTL, UL508, UL1998, and UL991, ensuring reliable performance in demanding environments. Each output is equipped with a status LED, providing immediate visual feedback for operational monitoring.

The KL2904 supports a 24 V DC supply (–15% / +20%) and draws maximum 250 mA from the K-bus. Its compact bus terminal design integrates easily with other Beckhoff Bus Terminals, providing 6-byte I/O process images, with maximum cable lengths of 100 m (shielded or unshielded) between terminal and sensor.

Engineered for industrial conditions, the KL2904 operates in 0–55 °C, tolerates 5–95% relative humidity, withstands shocks up to 15 g, and meets the IP20 protection rating, ensuring durability and reliable operation for safety automation applications.
Alternative Names
KLZ904 KL2g04 KL29O4 K12904 KI2904
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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.
Is the KL2904 in stock?
Stock status may vary. Please confirm with our sales team to ensure immediate shipment.
How many outputs does the KL2904 provide and what is the current rating?
It provides 4 fail-safe outputs with a maximum current of 0.5 A per channel (24 V DC).
Can you provide more photos or product details for the KL2904?
Yes, we can provide high-resolution real photos of the KL2904 upon request.
What safety standards does the KL2904 comply with?
The terminal meets IEC 61508 SIL 3, DIN EN ISO 13849-1 (Cat 4, PL e), NRTL, UL508, UL1998, and UL991.
What is the operating voltage and power consumption?
Supply voltage is 24 V DC (–15% / +20%), with a maximum K-bus current of 250 mA and typical power loss of 2 W.
What warranty does the KL2904 have?
Apter Power provides a 12-month warranty for the KL2904.
What is the permissible operating environment for the KL2904?
Operating temperature is 0–55 °C, storage/transport temperature is –25–70 °C, relative humidity 5–95%, and air pressure 750–1100 hPa.

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