Overview
The BK3120 Bus Coupler integrates up to 255 distributed Bus Terminals, extending the BK3xx0 series capabilities. It provides high-speed PROFIBUS DP V1 communication and direct access to bus registers for terminal parameterization. The Economy Plus design eliminates FMS operation, enhancing user data transfer efficiency in DP mode.
Key Features
- Flexible Device Integration: Supports up to 255 distributed Bus Terminals via K-bus extension.
- High-Speed Data Transfer: Operates up to 12 Mbaud with automatic baud rate detection.
- PROFIBUS DP V1 Support: Enables direct access to coupler registers and analog terminal adjustments.
- Compact DIN Rail Design: Features robust polycarbonate housing and signal LEDs for easy installation.
- Vibration and Shock Resistant: Conforms to EN 60068-2-6 and EN 60068-2-27 standards.
Technical Specifications
| Parameter | Specification |
|---|---|
| Number of Bus Terminals | 64 (up to 255 with K-bus extension) |
| Fieldbus Data Capacity | 128 byte input / 128 byte output |
| Data Transfer Rate | Automatic up to 12 Mbaud |
| Bus Interface | 1 x D-sub 9-pin socket with shielding |
| Data Transfer Medium | Shielded copper cable (2 x 0.25 mm²) |
| Power Supply | 24 V DC (-15% / +20%) |
| Input Current | 70 mA + (total K-bus current) / 4, max 500 mA |
| K-bus Current Supply | 1750 mA |
| Power Contacts | Max 24 V DC, max 10 A |
| Electrical Isolation | 500 V (power contact / supply voltage / fieldbus) |
| Weight | Approx. 170 g |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 95% non-condensing |
| Protection Rating | IP20 |
| Vibration / Shock | EN 60068-2-6 / EN 60068-2-27 |
| EMC Immunity / Emission | EN 61000-6-2 / EN 61000-6-4 |
| Approvals | CE, UL, ATEX, IECEx, DNV GL, cFMus |
| Housing Material | Polycarbonate |
| Dimensions (W x H x D) | 51 x 100 x 69 mm |
| Installation | Mountable on 35 mm DIN rail (EN 60715) |
Wiring and Connection Details
The BK3120 supports solid, stranded, and ferrule conductors using spring-actuated terminals. Connection cross-sections range from 0.08–2.5 mm² for solid or stranded wires, and 0.14–1.5 mm² for ferrules. Recommended stripping length is 8–9 mm. Power contacts can handle up to 10 A safely.
Applications and Integration
The Beckhoff BK3120 is ideal for industrial automation systems requiring high-speed data transfer and efficient integration. It suits complex PROFIBUS DP networks and ensures reliable performance under vibration, shock, and harsh environmental conditions.
Details
| Weight | 0.17 kg |
|---|
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