Evaluating P-NET Message's Response Time with Fixed Priority Queuing at Application Process Level
Ref: HURRAY-TR-9821 Publication Date: 4, Dec, 1998
Evaluating P-NET Message's Response Time with Fixed Priority Queuing at Application Process LevelRef: HURRAY-TR-9821 Publication Date: 4, Dec, 1998
P-NET is a multi-master fieldbus standard based on a virtual token passing scheme. In P-NET each master is allowed to transmit only one message per token visit. In the worst-case, the communication response time can be derived considering that, in each token cycle, all stations use the token to transmit a message. In this paper, we define a more sophisticated P-NET model, which considers the actual token utilisation. We then analyse the possibility of implementing a local priority-based scheduling policy to improve the real-time behaviour of P-NET.
19th IEEE Real-Time Systems Symposium (RTSS'98), WIP Session, pp 19-22.
Notes: Also Available as Technical Report UNL-CSE-98-002 from University of Nebraska-Lincoln, USA