What is Powerlink?
Powerlink, full name Ethernet POWERLINK, is an open-source industrial Ethernet standard designed for real-time communication in automation systems.
The protocol was originally developed by B&R Automation and is managed by the Ethernet POWERLINK Standardization Group (EPSG).
Powerlink is deterministic and well suited to Motion Control, machine control and time-critical applications.
⚙️ Key features of Powerlink
- Open standard (not tied to a single vendor)
- Based on standard Ethernet (IEEE 802.3)
- Real-time behaviour (deterministic, with cycle times below 200 µs)
- Suitable for motion control, I/O and safety applications
- Supports a master/slave architecture (controlled node and managing node)
- No additional hardware needed (works with standard network components)
🏭 Applications
| Sector | Examples |
|---|---|
| Mechanical engineering | Synchronous control of motors, axes and drives |
| Robotics | Time-critical communication between PLCs and servo drives |
| Packaging and material handling | Complex coordination between multiple devices |
| Energy and transport | Fast signal transfer within decentralised systems |
🔄 Powerlink vs. other fieldbuses
| Protocol | Real-time | Licence | Use |
|---|---|---|---|
| Powerlink | Yes (open source) | Freely available | Motion, real-time control |
| EtherCAT | Yes | Managed by Beckhoff | Motion and I/O, very fast |
| ProfiNET IRT | Yes (IRT mode) | Siemens ecosystem | Broadly applicable, including motion |
| IP | Limited real-time | Rockwell / ODVA | General use, less for motion |
🔐 Security and segmentation
Powerlink uses layer 2 Ethernet and typically runs on closed OT networks. When integrating with IT or cloud systems, the same best practices apply as for other industrial protocols:
- Use of Firewalls and the zone-and-conduits model
- Monitoring with SIEM or IDS systems
- Network segmentation (e.g. via VLANs)
📌 In summary
Powerlink is an open and real-time Ethernet protocol for industrial automation, with a focus on Motion Control and fast I/O. Thanks to its open nature and Ethernet foundation, it is a flexible alternative to commercial protocols such as EtherCAT or ProfiNET.