JSE_V3_N1_RP2 Saad H. Al-Tak Sufyan T. Faraj Journal on Software Engineering 2230 – 7168 3 1 12 22 Fieldbus, Wireless, Fault model, Inaccessibility, PROFIBUS, Transient faults, WCRT Fieldbus networks, as a part of distributed control applications, are subjected to harsh environment that may cause different faulty conditions. This is more pronounced in the case of hybrid wired/wireless networks because of the high susceptibility of wireless communication to such environment. PROFIBUS as one of the widely applied fieldbus protocols is considered here. Consequently, a timing analysis for hybrid wired/wireless PROFIBUS networks under a bounded error model is proposed. In this context, two alternatives for Hybrid Wired/Wireless - Multiple Logical Rings (MLR) - are discussed on the base of a single PROFIBUS network - the Single Logical Ring (SLR) - analysis. This work is essential to assess the real-time behaviour of such a PROFIBUS network under the incidence of errors. July - September 2008 Copyright © 2008 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=296