BK3120 Beckhoff "Economy Plus" Bus Coupler For PROFIBUS DP Networks 12 Mbaud 24

Product Specification

BK3120 Beckhoff "Economy Plus" Bus Coupler For PROFIBUS DP Networks 12 Mbaud 24 VDC

1.Overview of the BK3120 Beckhoff

The Beckhoff BK3120 is an "economy-enhanced" bus coupler for PROFIBUS DP networks. Serving as a bridge between higher-level control systems and lower-level execution units, it can integrate up to 255 distributed Bus Terminals into the automation network, playing a key role in industrial automation.

The BK3120 is a "economy-enhanced" PROFIBUS DP coupler launched by Beckhoff in 2024. It slots between the older BK3100 and the more compact BK3150. While maintaining a large 128-byte process data capacity, it offers a more affordable price. It's ideal for cost-sensitive upgrades and retrofits requiring high-speed DP communication.

2.Core Features:

Number of Bus Terminals supported: 64 (up to 255 with K-bus expansion)
Fieldbus data volume: 128 bytes input and 128 bytes output
Data transmission rate: Automatically detected, up to 12 Mbps
Bus interface: 1 D-sub 9-pin connector, shielded
Power supply: 24 V DC (-15%/+20%)
Input current: 70 mA + (total K-bus current) / max. 500 mA
K-bus supply current: 1750 mA
Power contact: max. 24 V DC / max. 10 A
Electrical isolation: 500 Vrms (power contacts/supply voltage/fieldbus)
Weight: Approx. 170 g
Operating temperature: 0…+55 °C
Storage temperature: -25…+85 °C
Relative humidity: 95%, non-condensing
Vibration/shock resistance: Complies with EN 60068-2-6/EN 60068-2-27/29 Standards
Electromagnetic interference/emission performance complies with EN 61000-6-2/EN 61000-6-4
Protection class IP20
Mounting method: Mounts on a 35 mm DIN rail, compliant with EN 60715, with lock
Dimensions (W x H x D): 51 mm x 100 mm x 69 mm

The BK3120 is designed with practicality and cost-effectiveness in mind for industrial applications. Its key features include:

Powerful scalability and flexibility: A single BK3120 coupler can directly connect up to 64 Bus Terminals. Beckhoff's K-bus expansion technology allows the number of modules in a station to be increased to 255, easily accommodating complex I/O configurations and providing exceptionally flexible system construction.

Optimized data transmission: This coupler is optimized for PROFIBUS DP mode, eliminating FMS operations in the protocol. This allows for the transmission of more user data, up to 128 bytes of input and 128 bytes of output. It supports transmission rates up to 12 Mbps and automatically detects baud rates, simplifying network setup.

Convenient parameterization and diagnostics: The BK3120 integrates PROFIBUS DP V1 services. These services provide direct access to bus coupler registers and complex Bus Terminals, facilitating parameterization or modification (for example, adjusting limit values ​​for analog terminals).

Industrial-Grade Durable Design: To withstand harsh industrial environments, the BK3120 features an IP20 protection rating, a wide operating temperature range of 0…+55°C, and can withstand 95% relative humidity (non-condensing). Its vibration and shock resistance meet EN 60068-2-6/EN 60068-2-27/29 standards, and its electromagnetic interference immunity meets EN 61000-6-2/EN 61000-6-4 standards, ensuring stable operation.

Compact Design and Cost-Effective: The product's compact housing (51 mm x 100 mm x 69 mm) helps save installation space in control cabinets. As part of the "Economy Plus" series, it offers powerful features while maintaining a high cost-effectiveness.

3.Product details pictures

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