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The move towards Ethernet based communication solutions in automation is accompanied by a need for determinism and real-time performance. The subject of this paper is the measured real-time performance across a switched Ethernet segment. Performance at 100 Mbps and 1 Gbps network speed was measured using UDP on Windows and Linux. Output stack times in the 8-16 mus range were measured with low processor...
The industrial communications field is experiencing the introduction of two major innovations, represented by the adoption of Ethernet and of wireless technologies, at the lowest level of factory automation systems, commonly referred to as field level. Since at such a level many installations are, at present, based on (traditional) fieldbuses, it is very likely that, in the near future, we will be...
This paper presents an architecture to build distributed embedded real-time systems in the RTLinux-GPL platform. The architecture (built in a layered fashion) has being built around open source projects ranging from Ethernet drivers to a CORBA environment. The paper focuses on those layers that give support for QoS and real-time networking over Ethernet networks. The main ideas are: to accomplish...
Event-based approaches are becoming more and more popular for building large scale distributed systems and applications, especially in the Internet environment. In this paper, the concept and techniques of event-based communications are first discussed. A hybrid approach of event-based communications for real-time manufacturing supervisory control is then proposed together with an "event-based...
Traceability in food chains is now mandatory for companies interested in food processing. Every food chain is made up of a variable number of companies which cooperate through the exchange of materials and services. Since the guarantee about a product doesn't depend on a single company, but it depends on all the factories of the food chain, a traceability system can provide information useful to reconstruct...
This paper describes a process and condition monitoring system based solely on 8-bit microcontrollers. These provide all the required processing and communication tasks. The complete system provides process monitoring to the local user and to remote users worldwide. It also has dynamic plug and play capability. The monitoring system provides fault resolution on individual process variables and interprets...
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