Powerlink real-time protocol
Ethernet Powerlink is a deterministic real-time protocol for standard Ethernet. It is an open protocol managed by the Ethernet POWERLINK Standardization Group (EPSG). It was introduced by Austrian automation company B&R in 2001.
Ethernet Powerlink expands Ethernet with a mixed polling and timeslicing mechanism. This provides:
- Guaranteed transfer of time-critical data in very short isochronic cycles with configurable response time
- Time-synchronisation of all nodes in the network with very high precision of sub-microseconds
- Transmission of less timecritical data in a reserved asynchronous channel
Modern implementations reach cycle-times of under 200 µs and a time-precision (jitter) of less than 1 µs.