Title :
Guaranteeing real-time message deadlines in PROFIBUS networks
Author :
Tovar, Eduardo ; Vasques, Francisco
Author_Institution :
Dept. of Comput. Sci., Polytech. Inst. of Porto, Portugal
Abstract :
The paper provides a comprehensive study on how to use Profibus networks to support real time communications, that is, ensuring the transmission of the real time messages before their deadlines. Profibus is based on a simplified Timed Token (TT) protocol, which is a well proved solution for real time communication systems. However, Profibus differences from the TT protocol prevent the application of the usual TT analysis. The main reason is that, conversely to the TT protocol, in the worst case, only one high priority message is processed per token visit. The major contribution of the paper is to prove that, despite this shortcoming, it is possible to guarantee communication real time behaviour with the Profibus protocol
Keywords :
access protocols; message passing; process control; real-time systems; PROFIBUS networks; Profibus protocol; TT analysis; TT protocol; distributed process control systems; high priority message; real time behaviour; real time communication systems; real time communications; real time message deadline guarantee; real time message transmission; simplified Timed Token protocol; Access control; Access protocols; Communication system traffic control; Computer science; Electrical capacitance tomography; Intelligent networks; Master-slave; Mechanical engineering; Media Access Protocol; Process control;
Conference_Titel :
Real-Time Systems, 1998. Proceedings. 10th Euromicro Workshop on
Conference_Location :
Berlin
Print_ISBN :
0-8186-8503-4
DOI :
10.1109/EMWRTS.1998.685071
