Beckhoff EtherNet/IP bus coupler for modular I/O terminals (10/100 Mbps, up to 64 terminals) - BK9105
The Beckhoff BK9105 is an EtherNet/IP bus coupler designed to interface modular Beckhoff I/O terminals with industrial Ethernet networks. Supporting 10/100 Mbps communication through dual RJ45 ports, it automatically identifies connected terminals and maps their signals to the controller’s process image. Operating on 24 VDC, the unit supports up to 64 terminals—or 255 with K-bus extension—for flexible system expansion.
Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Beckhoff |
| Category |
PLCs/Machine Control |
| Subcategory |
PLC Module/Rack |
| Part Number |
BK9105 |
| Protocol |
EtherNet/IP |
| Data Rates |
10/100 Mbps (auto-detection) |
| Bus Interface |
2 × RJ45 (2-channel switch) |
| Supported Terminals |
64 (255 with K-bus extension) |
| Max. Fieldbus Bytes |
492 input / 492 output |
| Digital Peripheral Signals |
3,936 I/O |
| Analog Peripheral Signals |
122 I/O |
| Configuration Tool |
KS2000 |
| Topology |
Line or star |
| Cascading |
Up to 20 BK9105 (max 2 km) |
| Distance Between Stations |
100 m max |
| Supply Voltage |
24 VDC (–15% / +20%) |
| Input Current |
70 mA + (K-bus current)/4, max 500 mA |
What our Experts Think
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A compact, high-performance servo solution, the Beckhoff AM8121-1F20-0000 from the AM8000 Series delivers precise motion control for demanding automation applications.
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0.16 kW servo power provides efficient performance, making it ideal for smaller machines, positioning systems, robotics, and motion-intensive equipment.
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48 V DC operation supports flexible machine designs, especially compact systems where space and energy efficiency are priorities.
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Designed for precision motion control, offering accurate positioning, smooth operation, and reliable dynamic response.
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Seamless integration with Beckhoff automation platforms, including TwinCAT and compatible servo drives, simplifies advanced motion applications.
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Compact motor design helps save installation space, enabling efficient machine layouts without compromising performance.
Q&A
Q: What is the Beckhoff AM8121-1F20-0000 Servo Motor?
A: The Beckhoff AM8121-1F20-0000 is a compact 48 V DC servo motor from the AM8000 series, designed for precise motion control in industrial automation systems.
Q: What are the key specifications of this servo motor?
A: It features 48 V DC operation, 0.16 kW rated power, 0.50 Nm rated torque, 2 Nm peak torque, and 3000 rpm rated speed for responsive motion applications.
Q: What applications is the AM8121-1F20-0000 used for?
A: It is commonly used in machine automation, robotics, handling systems, positioning equipment, and compact servo axis applications requiring accurate speed and position control.
Q: Is this motor compatible with Beckhoff motion systems?
A: Yes. The AM8000 series is designed for integration with Beckhoff servo drives and TwinCAT-based automation solutions.
Q: What type of feedback does the motor use?
A: The motor supports encoder-based feedback options for closed-loop control and precise positioning.
Q: Why choose a low-voltage servo motor?
A: A 48 V DC servo motor offers a compact, efficient solution for machines requiring precise motion control in smaller automation setups.
Q: What maintenance does a servo motor require?
A: Keep connectors clean, inspect cables, monitor operating temperatures, and ensure the motor is properly matched with its drive system for reliable performance.
Maintenance Tips
- Keep the motor housing clean and free from dust buildup.
- Inspect motor cables, connectors, and terminals regularly.
- Check for unusual noise, vibration, or temperature increases.
- Verify shaft alignment and mechanical coupling condition.
- Monitor load levels to prevent overheating or stress.
- Ensure proper ventilation around the motor.
- Inspect mounting hardware for tightness.
- Store in a dry, clean environment when not in use
Damage 
Loss 
Theft 
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