Browsing by Author "Machado, Sandra"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- A high performance wireless fieldbus in industrial multimedia-related environmentPublication . Alves, Mário; Tovar, Eduardo; Pacheco, Filipe; Ferreira, Luís; Pereira, Nuno; Machado, Sandra; Brandão, VeríssimoThis paper summarises the most important solutions that have emerged from the work carried out by our team within the framework of the EU (IST-1999-11316) project RFieldbus - High Performance Wireless Fieldbus in Industrial Multimedia-Related Environment. Within this project, Profibus was chosen as the fieldbus platform. Essentially, extensions to the current Profibus standard are being developed in order to provide Profibus with wireless, mobility and industrialmultimedia capabilities. In fact, providing these extensions means fulfilling strong requirements, namely to encompass the communication between wired (currently available) and wireless/mobile devices and to support real-time control traffic and multimedia traffic in the same network.
- Industrial multimedia put into practicePublication . Pacheco, Filipe; Pereira, Nuno; Marques, B.; Machado, Sandra; Marques, Luís; Pinho, Luís Miguel; Tovar, EduardoRecent developments in the factory floor technologies together with the widespread use of TCP/IP and the Internet are increasing the eagerness to support a new wide class of devices and applications, such as industrial multimedia applications, in factory floor networks. This paper presents how this new field of applications can be put into practice, via a manufacturing cell field trial being implemented. This manufacturing automation field trial involves the use of traditional distributed computer control systems and 'factory-floor-oriented' multimedia (e.g. voice, video) application services.
- Scheduling IP traffic in multimedia-enabled PROFIBUS networksPublication . Ferreira, Luís; Machado, Sandra; Tovar, EduardoTechnological developments are pulling fieldbus networks to support a new wide class of applications, such as industrial multimedia applications. To enable its use in this kind of applications the TCP/IP suite of protocols can be integrated within a fieldbus stack, leading to a dual-stack approach that is briefly outlined in the paper. One important requirement that must be fulfilled by this approach is that the hard real-time guarantees provided to the control-related traffic ("native" fieldbus traffic) are kept. At the same time it must also provide the desired quality of service (QoS) to IP applications. The focus of the paper is on how, in such a dual-stack approach, QoS can be efficiently provided to IP applications requiring quasi-constant bandwidth.