Profibus DP is a very popular fieldbus included in the IEC 61158 International Standard. The features of such a fieldbus make it particularly suitable for cyclic operations, but it also foresees the possibility of performing acyclic activities between masters and slaves. A second (undesired) type of acyclic traffic is that generated by the access to services of the Profibus data link layer prot...

The idea of having a wireless PROFIBUS is appealing, since this can bring benefits like reduced cabling need and mobile stations to the factory floor. But unfortunately wireless transmission is error-prone, which affects the timeliness and reliability behavior users expect from a fieldbus system (hard real-time). In this paper we compare two different approaches for the medium access control an...

This paper provides a comprehensive study on how to use Profibus fieldbus networks to support real-time industrial communications, that is, on how to ensure the transmission of real-time messages within a maximum bound time. Profibus is based on a simplified Timed Token (TT) protocol, which is a well-proved solution for real-time communication systems. However, Profibus differs with respect to ...

This paper provides an analysis of the real-time behaviour of the multimaster Profibus DP network. The analysis is based on the evaluation of the worstcase message response time and the results obtained are compared with those present in literature, pointing out its capability to perform a more accurate evaluation of the performance of the Profibus network. Copyright © 2002 IFAC

This paper investigates performances of PROFINET IO Class 1, based on Ethernet@100Mbit/s, as a replacement of PROFIBUS DP V2, based on RS485 @ 12Mbit/s, for the realization of time-critical and isochronous systems. In this work, two test systems have been built. In the first one, the same experimental setup with the same application has been implemented using PROFINET and PROFIBUS networks and ...