Beckhoff KL3042 Analog Input Terminal

The Beckhoff KL3042 is a 2-channel analog input Bus Terminal designed for reading current signals in the 0–20 mA range from field devices such as transducers or sensors. This compact terminal supplies power to the connected sensors via the power contacts and electrically isolates the analog measurement signals before transmitting them to the automation system.

With a resolution of 12 bits and a conversion time of approximately 2 ms, the KL3042 delivers accurate signal acquisition. Built-in diagnostic LEDs provide visual feedback for normal operation, overload, or wire breakage, ensuring safe and transparent monitoring in decentralized I/O configurations.

Technical Specifications

Part Number: KL3042 Beckhoff
Technology: Analog input, single-ended
Number of Inputs: 2 channels
Signal Current: 0…20 mA
Resolution: 12 bit
Conversion Time: ~ 2 ms
Internal Resistance: 80 Ω + 0.7 V diode drop
Surge Voltage Resistance: Max. 35 V
Measurement Error: < ±0.3% (relative to full-scale value)
Sensor Supply: Supplied via 24 V power contacts
Bit Width in Process Image: 2 × 16-bit data (2 × 8-bit control/status optional)
Configuration: No address or configuration setting
Special Features: Sensor power supply included

Power & Consumption

Power Supply: 24 V DC via power contacts
Current Consumption (Power Contacts): Load only
Current Consumption (K-bus): Typ. 65 mA
Electrical Isolation: 500 V (K-bus / signal voltage)

Mechanical Specifications

Dimensions (W x H x D): 12 mm × 100 mm × 68 mm
Weight: Approx. 70 g
Material: Polycarbonate
Installation: 35 mm DIN rail (EN 60715)
Design Form: Compact terminal with signal and error 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

✅ 0–20 mA Input Range: Suitable for current-based sensor applications.

✅ Integrated Sensor Power: Supplies 24 V directly from power contacts.

✅ 12-Bit Precision: Accurate analog acquisition for process monitoring.

✅ Overload and Wire Break Detection: Built-in diagnostic LEDs enhance safety.

✅ Compact Footprint: Just 12 mm wide – ideal for tight control cabinets.

✅ Isolated Design: 500 V electrical isolation between field and bus system.

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