The Beckhoff BK3120 PROFIBUS Economy Plus Bus Coupler is a compact and versatile I/O interface designed to integrate Beckhoff Bus Terminals with PROFIBUS DP networks. It is ideal for applications requiring scalable, distributed I/O solutions with robust fieldbus communication.
Bus Terminal Support: Connects up to 64 Bus Terminals directly; expandable to 255 using Beckhoff's K-bus extension technology.
Data Throughput: Supports up to 128 bytes of input and 128 bytes of output data in PROFIBUS DP mode, omitting FMS operation to maximize user data transfer.
PROFIBUS DP V1 Services: Enables direct access to Bus Coupler registers and complex Bus Terminals, allowing for parameterization adjustments and limit value settings for analog terminals.
Automatic Baud Rate Detection: Supports baud rates up to 12 Mbaud, automatically adapting to the network's requirements.
Power Supply: Operates on a 24 V DC supply with a maximum input current of 500 mA.
Environmental Compliance: Conforms to EN 60068-2-6 and EN 60068-2-27 standards for vibration and shock resistance.
Approvals: CE, UL, ATEX, IECEx, DNV GL, cFMus certified.
| Feature | Specification |
|---|---|
| Bus Terminal Capacity | Up to 64 (255 with K-bus extension) |
| Fieldbus Data | 128 bytes input / 128 bytes output |
| Baud Rate | Up to 12 Mbaud (auto-detected) |
| Bus Interface | D-sub 9-pin socket |
| 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 / 10 A |
| Isolation | 500 V (power/contact/supply/fieldbus) |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 95% RH, non-condensing |
| Dimensions (WxHxD) | 51 mm x 100 mm x 69 mm |
| Mounting | 35 mm DIN rail |
| Protection Rating | IP20 |
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