BK1250 - Beckhoff EtherCAT Coupler
Beckhoff EtherCAT Terminals model BK1250 is a compact EtherCAT Coupler designed for seamless fieldbus integration, offering reliable communication in automation systems.
| Brand | Beckhoff |
| Product Type | EtherCAT Coupler |
| Product | BK1250 |
BK1250 Beckhoff EtherCAT Coupler Technical Specifications
| Specification | Value |
|---|---|
| Number of Bus Terminals | 64 (255 with K-bus extension) |
| Max. number of bytes fieldbus | 1024 byte input and 1024 byte output |
| Configuration possibility | via KS2000 or EtherCAT (ADS) |
| Digital peripheral signals | 8,192 inputs/outputs |
| Analog peripheral signals | 256 inputs/outputs |
| Protocol | EtherCAT |
| Data transfer rates | 100 Mbit/s |
| Bus interface | via E-bus contacts |
| Power supply | 24 V DC (-15%/+20%) |
| Current supply E-bus | 500 mA |
| Input current | 70 mA + (total K-bus current)/4, 200 mA max. |
| Power contacts | max. 24 V DC/max. 10 A |
| Electrical isolation | 500 V (power contact/supply voltage/Ethernet) |
| Operating temperature | -25…+60°C |
| Storage temperature | -40…+85°C |
| EMC immunity/emission | conforms to EN 61000-6-2/EN 61000-6-4 |
| Relative humidity | 95%, no condensation |
| Vibration/shock resistance | conforms to EN 60068-2-6/EN 60068-2-27 |
| Protect. rating/installation pos. | IP20/variable |
| Approvals/markings | CE, CCC, UL, ATEX, IECEx |
| Ex marking | ATEX: II 3 G Ex ec IIC T4 Gc IECEx: Ex ec IIC T4 Gc |
| Weight | approx. 55 g |
The Beckhoff BK1250 EtherCAT Coupler provides reliable connectivity by linking up to 64 Bus Terminals, expandable to 255 with K-bus extension. It supports a high data throughput with 1024-byte input and 1024-byte output, ensuring smooth handling of digital signals (8,192 I/Os) and analog signals (256 I/Os). Powered by 24 V DC, it supplies up to 500 mA to the E-bus while maintaining strong 500 V electrical isolation between power, supply, and Ethernet. Designed to perform under harsh factory conditions, the BK1250 operates in a temperature range of -25°C to +60°C, tolerates humidity up to 95% RH, and complies with EN 61000-6-2/6-4 EMC standards. Compact and lightweight at just 55 g, the coupler delivers robust industrial reliability in IP20-rated enclosures.
The BK1250 EtherCAT Coupler is widely used in distributed automation systems, where engineers require fast and reliable communication between field devices and controllers. Its ability to handle thousands of I/O signals makes it ideal for complex applications in packaging, process automation, robotics, and smart manufacturing. Maintenance teams benefit from its compact design, modular scalability, and compliance with global certifications such as CE, UL, CCC, ATEX, and IECEx, which assure safe operation even in demanding environments. For students and young engineers, the BK1250 serves as a practical example of modular fieldbus integration, showing how scalable EtherCAT systems support future-ready industrial networks.
