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.
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.
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