Beckhoff KL1104 Digital Input Terminal

The Beckhoff KL1104 is a 4-channel digital input Bus Terminal designed to acquire 24 V DC binary signals from the field and transmit them to a higher-level controller with full electrical isolation. With a built-in 3.0 ms input filter, it ensures bounce-free signal acquisition, making it ideal for use with mechanical switches.

Conforming to EN 61131-2 type 1/3 input specifications, the KL1104 includes integrated 24 V and 0 V sensor supply connections and features LED indicators on each channel for instant signal monitoring. This compact terminal is perfectly suited for reliable input integration in decentralized I/O architectures.

Technical Specifications

Part Number: KL1104 Beckhoff
Technology: Digital input
Number of Inputs: 4 channels
Connection Technology: 2-/3-wire
Nominal Voltage: 24 V DC (-15% / +20%)
Signal Voltage “0”: -3…+5 V
Signal Voltage “1”: 15…30 V
Input Filter Time: Typ. 3.0 ms
Input Current: Typ. 5 mA
Specification Compliance: EN 61131-2, Type 1/3
Sensor Supply: +24 V DC and 0 V DC provided
Bit Width in Process Image: 4 inputs
Configuration: No address or configuration setting

Power & Consumption

Power Supply: 24 V DC sensor supply via terminal
Current Consumption (K-bus): Typ. 5 mA
Electrical Isolation: 500 V (K-bus / field potential)

Mechanical Specifications

Dimensions (W x H x D): 12 mm × 100 mm × 68 mm
Weight: Approx. 55 g
Material: Polycarbonate
Installation: 35 mm DIN rail (EN 60715)
Design Form: Compact terminal with signal LEDs
Pluggable Wiring: Compatible with all KSxxxx terminals
Wiring Method:
– Solid (s): 0.08…2.5 mm²
– Flexible (st): 0.08…2.5 mm²
– Ferrule (f): 0.14…1.5 mm²
AWG Range:
– Solid/Flexible: AWG28…14
– Ferrule: AWG26…16
Stripping Length: 8…9 mm

Environmental Conditions

Operating Temperature: -25°C to +60°C
Storage Temperature: -40°C to +85°C
Relative Humidity: 95%, no condensation
Vibration/Shock Resistance: EN 60068-2-6 / EN 60068-2-27
EMC Standards: EN 61000-6-2 / EN 61000-6-4
Protection Rating: IP20
Installation Position: Variable

Certifications & Compliance

Approvals: CE, CCC, UL, ATEX, IECEx, DNV GL
Ex Marking:
– ATEX: II 3 G Ex ec IIC T4 Gc
– IECEx: Ex ec IIC T4 Gc

Features & Benefits

✅ 4 Input Channels: Efficient binary signal acquisition in a compact form.

✅ Debounce Filtering: 3 ms input filter eliminates bouncing from mechanical switches.

✅ Type 1/3 Compliant: Conforms to EN 61131-2 standard for broad compatibility.

✅ Integrated Sensor Supply: Provides both +24 V DC and 0 V DC directly.

✅ LED Indicators: Channel-level signal visibility for diagnostics.

✅ Ultra-Slim Housing: Just 12 mm wide – ideal for space-saving installations.

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