Product details
BK9100 | Ethernet TCP/IP Bus Coupler
BK9100 connects Ethernet to modular I/O terminals. It supports up to 64 terminals (255 with K-bus extension). The coupler auto-assigns I/O to the process image. It runs at 10 or 100 Mbit/s via RJ45. The built-in 2-channel switch allows line topology – saves wiring and cost.
Key Features
- Ethernet TCP/IP – 10/100 Mbit/s auto-negotiation
- 2 x RJ45 – integrated 2-channel switch for line topology
- Supports TwinCAT ADS, Modbus TCP, Beckhoff real-time Ethernet
- IP address – via DIP switch (offset) or DHCP server
- Up to 20 couplers cascadable – line length up to 2 km
- Distance 100 m between stations
- Power supply 24 V DC (-15%/+20%)
- K-bus current up to 1750 mA
- Isolation 500 V (power/supply/fieldbus)
Technical Specifications
- Brand: Beckhoff
- Model: BK9100
- Number of terminals: 64 (255 with K-bus extension)
- Fieldbus bytes: 512 input / 512 output
- Digital signals: 512 I/O
- Analog signals: 128 I/O
- Protocols: TwinCAT ADS, Modbus TCP, Beckhoff real-time Ethernet
- Data rate: 10/100 Mbit/s auto-recognition
- Interface: 2 x RJ45 (2-channel switch)
- Cable: 4 x 2 twisted pair, Cat 3 (10M) / Cat 5 (100M)
- Power supply: 24 V DC (-15%/+20%)
- Input current: 70 mA + (K-bus current)/4 (max. 500 mA)
- Starting current: 2.5 x continuous
- Fuse: ≤ 10 A (recommended)
- K-bus current: 1750 mA
- Power contacts: 24 V DC / max. 10 A
- Isolation: 500 V
- Topology: line or star
- Cascading: up to 20 units or 2 km line length
- Distance: 100 m between stations
- Weight: approx. 170 g
- Operating temp.: -25…+60 °C
- Storage temp.: -40…+85 °C
- Humidity: 95 % (non-condensing)
- Vibration/shock: EN 60068-2-6 / EN 60068-2-27
- EMC: EN 61000-6-2 / EN 61000-6-4
- Protection: IP20
- Approvals: CE, UL, ATEX, IECEx, DNV GL
- Ex marking: ATEX: II 3 G Ex ec IIC T4 Gc / IECEx: Ex ec IIC T4 Gc
Housing & Wiring
- Design: compact terminal housing with signal LEDs
- Material: polycarbonate
- Dimensions (W x H x D): 51 mm x 100 mm x 69 mm
- Mounting: 35 mm DIN rail (EN 60715) with lock
- Side by side: double slot and key connection
- Wiring: spring actuation by screwdriver
- Cross-section: 0.08…2.5 mm² (solid/stranded) / 0.14…1.5 mm² (ferrule)
- Stripping length: 8…9 mm
- Power contact current: max. 10 A
Expert Review
“The BK9100 simplifies network design. The built-in switch lets you daisy-chain couplers – no extra hubs needed. It handles both ADS and Modbus TCP, making it versatile. A solid gateway for Beckhoff I/O.” – Senior Network Engineer
Manager’s Insight
“This coupler reduces cabling costs. The line topology saves time and materials. It is easy to configure via DIP switches or DHCP. Ideal for distributed I/O in large factories.” – Product Manager
Applications & Suitable Equipment
- Factory automation – connect remote I/O stations
- Process control – link sensors and actuators via Ethernet
- Building automation – distribute I/O over long distances
- Machine building – integrate with TwinCAT or Modbus systems
- Marine/offshore – DNV GL approved for harsh environments
Comparison with Similar Models
- BK9000 – single RJ45, star topology only
- BK9050 – same as BK9100 but without switch
- EL4034 – analog output terminal for signal generation
- KM1002 – digital input terminal
Frequently Asked Questions
- What is the maximum number of terminals?
64 directly, 255 with K-bus extension. - Can I use Modbus TCP with this?
Yes. It supports Modbus TCP and TwinCAT ADS. - How do I set the IP address?
Use the DIP switch (offset) or DHCP server. - What is the maximum cable length?
100 m between stations. Up to 2 km with 20 couplers. - Is it suitable for hazardous areas?
Yes. It has ATEX and IECEx approvals.
Experience-based Q&A
- What if I exceed 64 terminals?
Use a K-bus extension to reach 255 terminals. - Can I mix BK9100 with other couplers?
Yes, as long as they support the same protocol. - How to choose between BK9000 and BK9100?
Choose BK9100 for line topology and daisy-chaining.
Selection Guide
- Topology: Line – choose BK9100. Star – BK9000 may suffice.
- Number of I/O: Up to 512 digital or 128 analog channels.
- Protocol: Use ADS for TwinCAT, Modbus TCP for third-party systems.
- Environment: ATEX/IECEx certified for gas hazardous zones.
- Distance: 100 m per segment – plan for repeaters if longer.
Package Contents
- 1 x BK9100 Bus Coupler
- No additional accessories required
Warranty & Shipping
- Warranty: 12 months from date of purchase
- Dispatch: 12-24 hours after order
- Carriers: FedEx, UPS, DHL (express worldwide)
Contact us: sales@powergearx.com | +86 18030005825 (WhatsApp)
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