Multi-Master Profibus Dp Modelling and Worst Case Analysis-Based Evaluation

Cavalieri, Salvatore; Monforte, S.; Tovar, Eduardo; Vasques, Francisco

doi:10.3182/20020721-6-es-1901.00059

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…These models are usually very complex, and a very important open issue is the modelling of a communication stack without having to model all its protocols. An example of performance evaluation and of a modelling technique will be given in the last paper of this session (Cavalieri and Monforte, 2002). See (Navet, 1998) for more explanations on this point.…”

Section: Performance Evaluation;mentioning

confidence: 99%

Open Issues in Fieldbus Based Systems

Thomesse

2002

IFAC Proceedings Volumes

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Section: Performance Evaluation;mentioning

confidence: 99%

Open Issues in Fieldbus Based Systems

Thomesse

2002

IFAC Proceedings Volumes

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“…Moreover, and in the context of a pre-run-time schedulability analysis of PROF-IBUS messages e.g. [5,9], it becomes obvious that as T SL is a time component of the worst-case duration of a message transaction, its value will impact the evaluation of the worst-case message response time.…”

Section: The Impact Of Increased Latencies On the Duration Of Messagementioning

confidence: 99%

“…There is the need to compute and set a number of relevant network parameters in order to guarantee bounded message response times, among other system requirements (e.g. [5][6][7][8][9]). …”

Section: Context and Structure Of The Papermentioning

confidence: 99%

Engineering PROFIBUS networks with heterogeneous transmission media

Alves

Tovar

2006

Computer Communications

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A significant number of process control and factory automation systems use PROFIBUS as the underlying fieldbus communication network. The process of properly setting up a PROFIBUS network is not a straightforward task. In fact, a number of network parameters must be set for guaranteeing the required levels of timeliness and dependability. Engineering PROFIBUS networks is even more subtle when the network includes various physical segments exhibiting heterogeneous specifications, such as bus speed or frame formats, just to mention a few. In this paper we provide underlying theory and a methodology to guarantee the proper operation of such type of heterogeneous PROFIBUS networks. We additionally show how the methodology can be applied to the practical case of PROFIBUS networks containing simultaneously DP (Decentralised Periphery) and PA (Process Automation) segments, two of the most used commercial-off-the-shelf (COTS) PROFIBUS solutions. The importance of the findings is however not limited to this case. The proposed methodology can be generalised to cover other heterogeneous infrastructures. Hybrid wired/wireless solutions are just an example for which an enormous eagerness exists.

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Traffic Scheduling Anomalies in Temporal Partitions

Almeida

Pedreiras

Marau

From Model-Driven Design to Resource Management for Distributed Embedded Systems

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Many network protocols rely on temporal partitions to provide isolation between different nodes (TDMA slots) or different traffic classes (multi-phase cyclic frameworks). Typically, the duration of the slots or phases is not correlated with the duration of packet transmissions, which is variable and non-preemptive. Thus, it is possible that the limit of the slot or phase be overrun by an ongoing packet transmission or, if this cannot be tolerated, idletime must be inserted at the end of the slot or phase whenever a packet does not fit in. Nevertheless, both situations lead to scheduling anomalies in which the worst-case network delay does not occur necessarily with the synchronous release of all other packets, or just the higher priority ones. This paper highlights two such anomalies showing their origin and indicating that, in such circumstances, it is not possible to determine the worst-case network delay with exactitude in the general case. However, it is still possible to upper bound the network delay and the paper shows non-optimal solutions for those cases.

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Multi-Master Profibus Dp Modelling and Worst Case Analysis-Based Evaluation

Cited by 5 publications

References 3 publications

Open Issues in Fieldbus Based Systems

Open Issues in Fieldbus Based Systems

Engineering PROFIBUS networks with heterogeneous transmission media

Traffic Scheduling Anomalies in Temporal Partitions

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