Beckhoff KL3448 Analog Input Terminal

The Beckhoff KL3448 is an 8-channel analog input Bus Terminal designed for space-saving current signal acquisition in compact control cabinets. Each input channel processes analog current signals in the 0–20 mA range and converts them into a 12-bit digital value, electrically isolated for safe transmission to a higher-level automation device.

With its high-density design and 1-wire connection technology, the KL3448 is ideal for integrating multi-channel sensor systems efficiently. It features error diagnostics including overload and wire breakage detection, with LED indicators and K-bus integration for seamless automation system feedback.

Technical Specifications

Part Number: KL3448 Beckhoff
Technology: Analog input, single-ended
Number of Inputs: 8 channels
Signal Range: 0…20 mA
Resolution: 12 bit
Internal Resistance: < 85 Ω
Conversion Time: ~ 4 ms
Measurement Error: < ±0.3% (full scale)
Common-Mode Voltage: Not applicable
Surge Voltage Protection: 30 V DC
Bit Width in Process Image: 8 x 16-bit data (optional 8 x 8-bit control/status)
Configuration: No address or configuration setting
Special Features: High-density 8-channel input in compact housing

Power & Electrical Isolation

Power Supply: Via K-bus
Current Consumption (K-bus): Typ. 105 mA
Electrical Isolation: 500 V (K-bus/signal voltage)
Current Consumption (Power Contacts): Not applicable
Error Detection: Overload and wire breakage reporting via K-bus

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 compliant
Design Form: Compact terminal housing with signal LEDs
Wiring Method:
– Solid (s): 0.08…2.5 mm²
– Flexible (st): 0.08…2.5 mm²
– Ferrule (f): 0.14…1.5 mm²
Stripping Length: 8–9 mm
Current Load Power Contacts: Imax: 10 A
Side-by-Side Mounting: Double slot and key connection

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

✅ 8 Analog Inputs: Ideal for current-based sensor systems in compact setups.

✅ High-Density Design: 8 channels in a slim 12 mm housing.

✅ Accurate Conversion: 12-bit resolution with fast ~4 ms response.

✅ Diagnostic Reporting: Overload and wire breakage detection via K-bus.

✅ LED Status Indication: Visual feedback for communication and error states.

✅ Tool-Free Wiring: Pluggable KS terminals available for rapid installation.

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