Supporting internet protocols in master-slave fieldbus networks

Pacheco, Filipe; Tovar, Eduardo; Kalogeras, A.; Pereira, Nuno

http://hdl.handle.net/10400.22/3495

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In this paper we describe how to integrate Internet Protocols (IP) into a typical hierarchical master-slave fieldbus network, supporting a logical ring token passing mechanism between master stations. The integration of the TCP/IP protocols in the fieldbus protocol rises a number of issues that must be addressed properly. In this paper we particularly address the issues related to the conveyance of IP fragments in fieldbus frames (fragmentation/de-fragmentation) and on how to support the symmetry inherent to the TCP/IP protocols in fieldbus slaves, which lack communication initiative.