Ethernet slip rings
Senring Industrial bus slip rings (BM/BH)
Signal slip rings for fieldbus and Ethernet, listed for PROFIBUS, CANbus, DeviceNet, ControlNet, RS-232/422/485, USB and 10/100/1000BASE-T Ethernet, in solid-shaft (BM) and through-bore (BH, up to 50 mm) versions with up to 168 circuits and 690 V.
Need this part, a replacement or a better-fit option? Our engineers help with selection, procurement, sourcing, competitive pricing and lead times.
Engineering support · Product sourcing · Procurement
Get pricing or a checked replacement
Need Senring parts, a replacement or another suitable option? Send your part number or describe the application. We’ll review the requirement and help with product selection, sourcing, pricing and lead times.
- Exact parts and engineer-checked alternatives
- Manufacturer-direct options where available
- Standard, modified and custom solutions
No obligation to buy. Have a datasheet, drawing or nameplate photo? Reply to your confirmation email to attach it.
Need help choosing? Build a specification →Need help choosing? Open the specification builder
Spec builder
Specify what you need instead of Industrial bus slip rings (BM/BH)
Select every part you need, answer the questions an applications engineer would ask, and see your summary before we ask for any details.
- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
Key specifications
| Circuits (max) | 168 |
|---|---|
| Voltage (max) | 690 V |
| Bore (max) | 50 mm |
| Outer diameter | 56–130 mm |
| Data / bus | Ethernet 10/100/1000BASE-T, PROFIBUS, CANbus, DeviceNet, ControlNet, LonWorks, RS-232, RS-422, RS-485, USB |
Summarised in our own words from SENRING Electronics Co., Limited's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Current, speed and IP not published per model.
Specify Motion is not affiliated with SENRING Electronics Co., Limited. Senring and Industrial bus slip rings (BM/BH) are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Engineer support
Speak to our engineers about your project
Our experienced engineers are on hand, ready to help with your project. Whether you need the Senring Industrial bus slip rings (BM/BH) itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
- Help sourcing Industrial bus slip rings (BM/BH) and spares for installed machines
- Modified and custom designs when a catalogue part doesn't fit
- Complete axis: motor, drive, gearing and feedback matched together
Typical applications
What an ethernet slip ring is
An Ethernet slip ring is a rotary joint designed to pass industrial Ethernet, such as 100 Mbit/s or gigabit links, through continuous rotation without unacceptable packet loss. The data rings are laid out as matched pairs with controlled impedance, short stubs and screening from power rings, and the brushes are chosen for low, stable contact resistance. Some units use contactless capacitive, inductive or optical channels for the highest rates. Most combine the Ethernet channels with power and discrete signal rings in one housing.
When engineers choose an ethernet slip ring
Choose an Ethernet slip ring when the rotating part carries cameras, drives, remote I/O or sensors on a network, which cuts the ring count compared with hard-wiring every signal. It suits indexing machines, packaging turrets and gimbals running EtherCAT, PROFINET or EtherNet/IP. The trade-offs are cost and validation: contact rings add small resistance changes, and gigabit links are more sensitive than 100 Mbit/s. For very high data rates, long life or high speed, a fibre optic or contactless channel may be better.
How to specify the Senring Industrial bus slip rings (BM/BH)
Send these with your enquiry and an engineer can confirm the right Industrial bus slip rings (BM/BH) variant or an equivalent:
- Protocol and data rate, such as EtherCAT, PROFINET or gigabit Ethernet
- Number of Ethernet channels and pairs per channel
- Required test standard or bit error rate target
- Power circuits and current per circuit (A)
- Speed (rpm) and expected life (revolutions)
- Cable type and connectors on each side, such as RJ45 or M12
- Cable lengths to the nearest switch or node (m)
Common mistakes to avoid
- Specifying gigabit when the network only needs 100 Mbit/s, which adds cost and complexity
- Ignoring the cable runs on each side, which count towards the total channel length and loss
- Routing motor power next to data rings without screening or separation
- Not testing the full link with the real protocol under rotation before production
Senring Industrial bus slip rings (BM/BH): frequently asked questions
Can you help replace Senring Industrial bus slip rings (BM/BH) or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including Motion Control Products options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Senring Industrial bus slip rings (BM/BH)?
Signal slip rings for fieldbus and Ethernet, listed for PROFIBUS, CANbus, DeviceNet, ControlNet, RS-232/422/485, USB and 10/100/1000BASE-T Ethernet, in solid-shaft (BM) and through-bore (BH, up to 50 mm) versions with up to 168 circuits and 690 V. Published series figures include circuits 168, voltage 690 V, bore 50 mm, outer diameter 56 mm. It is made by SENRING Electronics Co., Limited; Specify Motion can help source it or propose an equivalent.
Who makes the Senring Industrial bus slip rings (BM/BH)?
The Senring Industrial bus slip rings (BM/BH) is made by Senring (SENRING Electronics Co., Limited) and is listed here for engineers comparing options. Specify Motion is not affiliated with SENRING Electronics Co., Limited; brand names are used only to identify the product.
What is the circuits of the Senring Industrial bus slip rings (BM/BH)?
The published series maximum circuits is 168. Individual models and sizes in the Industrial bus slip rings (BM/BH) range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Senring Industrial bus slip rings (BM/BH)?
We can assess suitable replacement options. Our engineers can review the original model and propose options for your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
Can EtherCAT and PROFINET run through a slip ring?
Yes, when the slip ring is designed for it. Real-time protocols are sensitive to link drops, so the data rings need controlled impedance, good screening and stable contact resistance. Tell the supplier the protocol, cycle time and number of nodes on the rotating side, and test the full network under rotation. Many suppliers validate their Ethernet rings against standard cabling test methods.
What is the difference between a contact and a contactless Ethernet slip ring?
A contact slip ring passes the signal through brushes on rings, which is economical and handles 100 Mbit/s and often gigabit links well. A contactless channel uses capacitive, inductive or optical coupling, so there is no wear on the data path and very high rates or speeds are possible. Contactless channels cost more and usually still need contact rings for power.
Further reading: Ethernet through slip rings · How to select a slip ring · Slip rings
Other ethernet slip rings series
Engineer support
Our engineers are ready to help with your project
Tell us about your project and how you use the Senring Industrial bus slip rings (BM/BH): the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
- Reviewed by an engineer, not an autoresponder
- Like-for-like and better-fit alternatives
- Standard, modified and custom options
Prefer to configure it? Use the spec builder.