Before procurement teams confirm BK9103, they typically review Beckhoff Bk5200, Beckhoff Bk9000 and Beckhoff Bk9105 to double-check performance ratings, stock availability, and supplier credibility carefully.
BK9103 - Beckhoff EtherCAT Bus Couplers
Beckhoff EtherCAT Bus Couplers BK9103 provide reliable connectivity between field I/O and PROFINET networks, designed for scalable and high-performance industrial automation.
| Brand | Beckhoff |
| Product Type | EtherCAT Bus Couplers |
| Product | BK9103 |
BK9103 Beckhoff EtherCAT Bus Couplers Technical Specifications
| Specification | Value |
|---|---|
| Number of Bus Terminals | 64 (255 with K-bus extension) |
| Max. number of bytes fieldbus | 512 byte input and 512 byte output |
| Configuration possibility | via KS2000 |
| Data transfer rates | 10/100 Mbit/s, automatic recognition of the transmission rate |
| Bus interface | 2 x RJ45 (2-channel switch) |
| Data transfer medium | 4 x 2 twisted pair copper cable; category 3 (10 Mbit/s), category 5 (100 Mbit/s) |
| Power supply | 24 V DC (-15%/+20%) |
| Input current | 70 mA + (total K-bus current)/4, 500Â mA max. |
| Starting current | 2.5 x continuous current |
| Recommended fuse | ≤ 10 A |
| Current supply K-bus | 1750 mA |
| Power contacts | max. 24 V DC/max. 10 A |
| Electrical isolation | 500 V (power contact/supply voltage/fieldbus) |
| Distance between stations | 100 m between hub/switch and bus coupler or between bus coupler and bus coupler |
| Weight | approx. 170 g |
| Operating temperature | -25...+60°C |
| Storage temperature | -40...+85°C |
| 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 |
| Protect. rating/installation pos. | IP20/variable |
| Approvals/markings | CE, CCC, UL, ATEX, IECEx, DNV GL |
| Ex marking | ATEX: II 3 G Ex ec IIC T4 GcIECEx: Ex ec IIC T4 Gc |
| Housing - Design form | compact terminal housing with signal LEDs |
| Housing - Material | polycarbonate |
| Housing - Dimensions (W x H x D) | 51 mm x 100 mm x 69 mm |
| Housing - Installation | on 35 mm DIN rail, conforming to EN 60715 with lock |
| Housing - Side by side mounting by means of | double slot and key connection |
| Housing - Marking | labeling of the BZxxxx series |
| Housing - Wiring | solid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver |
| Housing - Connection cross-section | s*: 0.08...2.5 mm²,st*: 0.08...2.5 mm²,f*: 0.14...1.5 mm² |
| Housing - Stripping length | 8...9 mm |
| Housing - Current load power contacts | Imax: 10 A |
| Digital peripheral signals | 512 inputs/outputs |
| Analog peripheral signals | 256 inputs/outputs |
| Protocol | PROFINET RT (Class B) |
| Topology | line or star wiring |
| Cascading | up to 20 BK9103 or max. line length 2 km |
The Beckhoff BK9103 EtherCAT Bus Couplers combine compact design with powerful features, making them highly efficient in automation systems. They support up to 64 bus terminals, expandable to 255 with K-bus extension, ensuring flexibility in large I/O structures. With 512-byte input and 512-byte output handling, the device delivers fast, stable data exchange across networks.
The coupler operates on a 24 V DC supply and provides 500 V isolation for safe and reliable operation. Dual RJ45 interfaces allow line or star topology, while PROFINET RT Class B protocol guarantees compatibility with modern systems. Its IP20 polycarbonate housing, vibration resistance, and wide operating range from -25°C to +60°C make it durable in demanding environments. Global certifications including CE, UL, ATEX, and IECEx ensure compliance and trust for industrial users worldwide.
The BK9103 Beckhoff EtherCAT Bus Couplers are widely used in applications such as packaging lines, automotive assembly, robotics, and process automation. Maintenance engineers appreciate the ease of DIN rail installation and KS2000 software configuration, which save setup time. With the ability to handle both digital and analog signals, it suits complex factories that require reliability and real-time performance.
For engineering students and junior professionals, the BK9103 offers a practical way to understand industrial networking and PROFINET communication. Senior engineers rely on its proven stability and certifications for mission-critical operations. If you need a dependable, scalable solution that connects PROFINET networks with I/O modules, the Beckhoff BK9103 EtherCAT Bus Coupler is an ideal choice. Request a call back today to get detailed support for your automation requirements.
