Description
Engineered for processing standardized analog current signals, the Beckhoff KL3444 Bus Terminal processes signals in the 0 to 20 mA range with high-resolution acquisition. This compact, 12 mm wide module features four single-ended input channels, making it optimal for spaced-constrained control cabinets requiring multi-channel density. The device derives its power directly from the internal K-bus system, enabling seamless communication with the master PLC or industrial PC coupler. Utilizing 12-bit digital resolution, the module ensures accurate transmission of system variables to the controller. A robust design featuring 500 V galvanic isolation between the K-bus and the field signal inputs guarantees system stability and protects sensitive control-side electronics from external electrical disturbances.
Features
- Four single-ended analog input channels operating in the 0 to 20 mA range.
- Fast conversion time of approximately 2 ms for real-time monitoring.
- Galvanic isolation of 500 V between the K-bus and the input signal lines.
- Compact KL-12-8pin housing with integrated status LEDs for quick diagnostic checks.
- Tool-free mounting on 35 mm DIN rails via double slot-and-key connection.
- Spring-clamp termination for quick, vibration-resistant field wiring.
Applications
- Process manufacturing and chemical plant signal monitoring.
- Water and wastewater pressure/flow sensor integration.
- Machine building and factory automation telemetry.
- HVAC control and environmental monitoring systems.
Ordering Information
| Model / Part Number |
Description |
| KL3444 |
Bus Terminal, 4-channel analog input, current, 0 to 20 mA, 12 bit, single-ended |
| KS3444 |
Bus Terminal, 4-channel analog input, current, 0 to 20 mA, 12 bit, single-ended, pluggable wiring |
Technical Specifications
| Parameter |
Specification |
| Manufacturer |
BECKHOFF |
| Part Number / Model |
KL3444 |
| Number of Inputs |
4 |
| Signal Current |
0 to 20 mA |
| Technology |
Single-ended |
| Internal Resistance |
< 85 Ohm |
| Conversion Time |
~ 2 ms |
| Resolution |
12 bit |
| Measuring Error |
< +/-0.3% (relative to full scale value) |
| Surge Voltage Resistance |
30 V DC |
| Electrical Isolation |
500 V (K-bus / signal voltage) |
| Current Consumption K-bus |
typ. 85 mA |
| Bit Width in Process Image |
Input: 4 x 16 bit data (4 x 8 bit control/status optional) |
| Weight |
approx. 55 g |
| Operating Temperature |
0 to +55 degC |
| Storage Temperature |
-25 to +85 degC |
| Relative Humidity |
95%, no condensation |
| Vibration/Shock Resistance |
Conforms to EN 60068-2-6 / EN 60068-2-27 |
| EMC Immunity/Emission |
Conforms to EN 61000-6-2 / EN 61000-6-4 |
| Protection Class |
IP20 |
| Housing Dimensions (W x H x D) |
12 mm x 100 mm x 68 mm |
Installation Guidelines
-
Mounting: Snap securely onto a standard 35 mm DIN rail (conforming to EN 60715). Ensure the locking mechanism is engaged.
-
Wiring: Use solid (0.08 to 2.5 mm²), flexible (0.08 to 2.5 mm²), or ferruled (0.14 to 1.5 mm²) conductors. Push a suitable screwdriver into the spring release to insert the wire.
-
Shielding: Route signal lines away from high-power distribution lines. Use shielded cables in high-noise environments to ensure signal integrity.
-
Ventilation: Maintain standard operating spacing around the module to prevent thermal buildup, ensuring ambient temperature remains below +55 degC.
Compliance and Certifications
- CE
- UL
- ATEX: II 3 G Ex nA IIC T4 Gc
- DNV GL