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KL1904

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The Beckhoff KL1904 is a 4-channel TwinSAFE digital input terminal block designed for 24V DC potentialless contact sensors, combining high safety levels with fast response characteristics.
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Technical specifications for KL1904

  • Manufacturer:
    BECKHOFF
  • Part Number:
    KL1904
  • Product Family:
    BECKHOFF
  • Number of inputs/outputs:
    4/0
  • Status display:
    4 (one green LED per input), maximum: see fault reaction time
  • Reaction time (read input / write to K-bus):
    typically: 4 ms
  • Fault reaction time:
    ≤ watchdog time
  • Cable length between sensor and terminal:
    100 m max. (at 0.75 or 1 mm²)
  • Input/Output process image:
    6 bytes
  • KL1904 supply voltage:
    24 VDC (–15% / +20%)
  • Current consumption of the module electronics at 24 V:
    4 channels occupied: typically 12 mA; 0 channels occupied: typically 1 mA
  • Current consumption via K-bus:
    4 channels occupied: typically 47 mA; 0 channels occupied: typically 33 mA
  • Power loss of the terminal:
    typically 540 mW
  • 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:
    750 hPa ... 1100 hPa
  • Protection rating:
    IP20
  • Weight:
    0.05 kg
  • Estimated shipping dimensions:
    12x10x6.8cm
  • 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 KL1904 is a TwinSAFE digital input terminal designed for use with transducers featuring potential-free contacts at 24 V DC. The terminal provides four fail-safe inputs, enabling reliable integration into safety-critical automation systems. Its compact bus terminal design ensures seamless connection within Beckhoff I/O systems.

Equipped with status LEDs for each input, the KL1904 provides clear visual feedback and supports rapid fault detection, with typical input-to-K-bus reaction times of 4 ms and fault reaction times aligned with watchdog monitoring. It supports a maximum cable length of 100 m, allowing flexible installation in industrial environments.

The KL1904 is fully compliant with international safety standards, including IEC 61508:2010 SIL 3, DIN EN ISO 13849-1:2006 (Cat 4, PL e), and recognized by NRTL, UL508, UL1998, and UL991. This ensures robust operation in high-reliability applications such as machinery safety and automated process monitoring.

Designed for durability, the terminal operates across 0 °C to +55 °C, with storage and transport tolerance from –25 °C to +70 °C, and a humidity range of 5–95 % RH (non-condensing). The board has a protection rating of IP20 and features low power consumption, making it efficient and dependable for industrial automation setups.
Alternative Names
KL1g04 KLI904 KL19O4 Kl1904
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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 Beckhoff KL1904?
The KL1904 is a TwinSAFE digital input terminal with four fail-safe inputs for 24 V DC transducers.
How fast can the KL1904 be shipped?
Shipping depends on stock availability. If the KL1904 is in stock, we can ship within 2–3 business days.
What warranty does the KL1904 have?
Apter Power provides a 12-month warranty for the KL1904.
How many inputs and outputs does KL1904 support?
The terminal supports 4 inputs and 0 outputs.
What is the supply voltage of KL1904?
The KL1904 operates at 24 V DC (–15% / +20%).
What are the operating temperature and storage conditions?
Operating temperature is 0 °C to +55 °C; storage/transport range is –25 °C to +70 °C.

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