Ethernet-based real-time communications with PROFINET IO
Peter G. Neumann, Axel Y. Poschmann · ACMOS'05 Proceedings of the 7th WSEAS international conference on Automatic control, modeling and simulation · 2005
The fieldbus systems have been successfully introduced in the industrial automation. Nowadays, a large community is inventing the usage of Ethernet-based local communication systems in this domain ensuring the real-time behaviour of these systems. Profinet IO provides the service definition and protocol specification for real-time communication based on Ethernet, IP, and UDP for the field area. It defines services and protocols mainly for communication between IO controllers (e.g. a PLC) and IO devices (e.g. Remote IO). It includes a QoS architecture for real time control and alarm messages taking precedence over parameter, diagnosis, or infrastructure messages including other TCP or UDP based protocols. High message priorities in combination with a time division multiplexing approach with direct data link layer access provide short cycle times and low jitter.