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Advisor(s)
Abstract(s)
In this paper we describe a real-time industrial communication network able to support both controlrelated
and multimedia traffic. The industrial communication network is based on the PROFIBUS
standard, with multimedia capabilities being provided by an adequate integration of TCP/IP protocols into
the PROFIBUS stack. From the operational point of view the integration of TCP/IP into PROFIBUS is by
itself a challenge, since the master-slave nature of the PROFIBUS MAC makes complex the
implementation of the symmetry inherent to IP communications. From the timeliness point of view the
challenge is two folded. On one hand the multimedia traffic should not interfere with the timing
requirements of the "native" control-related PROFIBUS traffic (typically hard real-time). On the other
hand multimedia traffic requires certain levels of quality-of-service to be attained. In this paper we
provide a methodology that enables fulfilling the timing requirements for both types of traffic in these
real-time industrial LAN. Moreover, we describe suitable algorithms for the scheduling support of
concurrent multimedia streams.
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Publisher
IPP-Hurray Group. Universidade do Porto.