Beckhoff KL1889 Digital Input Terminal

The Beckhoff KL1889 is a high-density 16-channel digital input Bus Terminal that captures binary 24 V DC signals and transmits them with electrical isolation to upper-level control systems. Designed for ground-switching applications, it features a 3 ms input filter to suppress signal bouncing from mechanical switches, making it ideal for clean signal acquisition in industrial environments.

The KL1889 utilizes space-efficient 1-wire connection technology and includes tool-free direct plug-in wiring for solid conductors. Its compact 12 mm width and HD housing make it a powerful choice for control cabinets with high input density requirements.

Technical Specifications

Part Number: KL1889 Beckhoff
Technology: Digital input, ground switching
Number of Inputs: 16 channels
Connection Technology: 1-wire
Nominal Voltage: 24 V DC (-15% / +20%)
Signal Voltage “0”: 18…30 V
Signal Voltage “1”: 0…7 V
Input Filter Time: Typ. 3.0 ms
Input Current: Typ. 3 mA
Bit Width in Process Image: 16 inputs
Configuration: No address or configuration setting
Special Features: Ground switching, tool-free direct plug-in wiring

Power & Consumption

Power Supply: 24 V DC via power contacts
Current Consumption (Power Contacts): Typ. 4 mA + load
Current Consumption (K-bus): Typ. 20 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: HD (High Density) housing with signal LEDs
Pluggable Wiring: Solid wires (direct plug-in); stranded wires/ferrules via spring terminal
Wiring Method:
– Solid (s): 0.08…1.5 mm² (tool-free)
– Flexible (st): 0.25…1.5 mm²
– Ferrule (f): 0.14…0.75 mm²
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 (see documentation)

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

✅ 16 High-Density Inputs: Capture multiple digital signals in just 12 mm of panel space.

✅ Ground-Switching Design: Ideal for direct connection of sinking sensors.

✅ Debounce Filtering: 3 ms input filter eliminates mechanical switch bounce.

✅ Tool-Free Wiring: Plug-in solid conductors directly without tools.

✅ LED Diagnostics: Status indication for all 16 channels.

✅ Compact HD Housing: Perfect for space-constrained automation panels.

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Designed for high-density digital signal acquisition, the KL1889 delivers robust and compact performance for modern control systems with demanding input requirem