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2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)最新文献

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A distributed simulator for large networks used in building automation systems 用于楼宇自动化系统中大型网络的分布式模拟器
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-09-06 DOI: 10.1109/WFCS.2000.882551
R. Hunstock, S. Ruping, U. Ruckert
{"title":"A distributed simulator for large networks used in building automation systems","authors":"R. Hunstock, S. Ruping, U. Ruckert","doi":"10.1109/WFCS.2000.882551","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882551","url":null,"abstract":"In modern building automation systems an increasing number of devices with computational facilities exchange data and interoperate using underlying control networks. Discontinuous and nonlinear processes, synchronization effects and delays in communication lead to systems with highly complex behavior. Analytical methods often do not meet the demands for the evaluation of such systems. As an alternative approach, discrete event simulation gains more and more importance. The authors present the development of a distributed software simulator especially designed for large automation systems consisting of thousands of microcontroller based devices. An existing and expanding building automation system used to validate the simulator and which forms a base for modeling a large system is also described.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126727192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Combining event-triggered and time-triggered traffic in FTT-CAN: analysis of the asynchronous messaging system 结合FTT-CAN中事件触发和时间触发的流量:异步消息传递系统的分析
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-09-06 DOI: 10.1109/WFCS.2000.882535
P. Pedreiras, L. Almeida
{"title":"Combining event-triggered and time-triggered traffic in FTT-CAN: analysis of the asynchronous messaging system","authors":"P. Pedreiras, L. Almeida","doi":"10.1109/WFCS.2000.882535","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882535","url":null,"abstract":"For some years, there has been a debate opposing event-triggered and time-triggered traffic paradigms in fieldbuses. While the former is better suited to sporadic sources of information, the latter is more suited to periodic streams of information. However, for certain applications, such as flexible real-time systems, a combination of both paradigms is desirable. The authors have recently proposed a new controller area network (CAN) based protocol, called FTT-CAN (Flexible Time-Triggered communication on CAN), that supports time-triggered communication in a flexible way. It also allows an efficient combination of both time-triggered and event-triggered traffic with temporal isolation. This paper describes the asynchronous messaging system of the FTT-CAN protocol which is responsible for the support of event-triggered traffic. Furthermore, a response time analysis is carried out concerning the handling of asynchronous communication requests.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117092210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 39
Security considerations for FAN-Internet connections 风扇-互联网连接的安全考虑
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-09-06 DOI: 10.1109/WFCS.2000.882530
P. Palensky, T. Sauter
{"title":"Security considerations for FAN-Internet connections","authors":"P. Palensky, T. Sauter","doi":"10.1109/WFCS.2000.882530","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882530","url":null,"abstract":"The interconnection between field area networks and IP-based LANs, as well as the Internet as a whole, is becoming increasingly popular. Emerging security issues have been neglected or underrated in the past. However, traditional security concepts that work well for LANs and the Internet are hardly applicable to field bus systems. Based on an example from home automation, we review the problem and consider ways to prevent attacks both from the outside world and from within the field bus. Particular emphasis is given to firewalls, which are found to be only of limited value for securing field bus-Internet gateways. To tackle the security problem both on the field bus level and on the Internet, we propose the use of smart cards for authentication and encryption. We discuss modifications that are necessary to make field bus nodes secure, why smart cards are \"different\" and strategies to implement access control on the gateway.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133939281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 45
Radio communication in automation systems: the R-fieldbus approach 自动化系统中的无线电通信:r -现场总线方法
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-09-06 DOI: 10.1109/WFCS.2000.882564
Joerg Haehniche, V. E, Steinfeld
{"title":"Radio communication in automation systems: the R-fieldbus approach","authors":"Joerg Haehniche, V. E, Steinfeld","doi":"10.1109/WFCS.2000.882564","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882564","url":null,"abstract":"Modern production systems and production plants require new and advanced automation features that are characterized by more flexibility and mobility of automation devices as well as multi-media transmission besides real-time data transmission. The EU founded research project \"R-Fieldbus: High performance wireless fieldbus in industrial related multi-media environment\" has the objective to develop a radio based physical layer based on the existing and available radio technologies in the LAN and WAN world. Basis for this development are furthermore the requirements of the production systems, from the user as well as the industrial environment. In this paper we introduce the objectives of the R-Fieldbus project, the requirements as basis for the development as well as the first investigations of the radio channel characteristics in industrial environmental conditions.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134436734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 43
A framework for fieldbus management using XML descriptions 一个使用XML描述的现场总线管理框架
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-09-06 DOI: 10.1109/WFCS.2000.882527
M. Wollschlaeger
{"title":"A framework for fieldbus management using XML descriptions","authors":"M. Wollschlaeger","doi":"10.1109/WFCS.2000.882527","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882527","url":null,"abstract":"The adoption of Internet related technologies throughout industrial communication systems enables Web based solutions for their management. This requires effective methods for modeling and description of the managed systems and components. The Extensible Markup Language XML provides a promising solution for a general purpose description. Based on exemplary solutions for different fieldbusses, the paper shows concepts, description methods, software tools, and migration paths in XML based frameworks. These frameworks use a hierarchically organized structure of linked XML description files. Appropriate solutions using style sheets and scripts are explained. Special attention is paid to description approaches suitable for an integration of heterogeneous systems into a unique management framework.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130463095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Jitter minimization with genetic algorithms 遗传算法的抖动最小化
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-09-06 DOI: 10.1109/WFCS.2000.882558
F. Coutinho, J. Barreiros, J. Fonseca, E. Costa
{"title":"Jitter minimization with genetic algorithms","authors":"F. Coutinho, J. Barreiros, J. Fonseca, E. Costa","doi":"10.1109/WFCS.2000.882558","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882558","url":null,"abstract":"Transmission network induced jitter in periodic control variables is a known problem on field bus based distributed systems for embedded control applications. This jitter can be reduced or eliminated if adequate release instants are imposed to the periodic messages transmitted. In this paper, jitter reduction is achieved testing a variant genetic algorithm that determines an adequate initial phasing. This algorithm can be used progressively, i.e. it can work first on a subset of the messages, thus finding solutions for the higher priority ones, and later including the other messages until the whole set is considered. Experimental results obtained with two well-known and widely used benchmarks, the PSA, coming from automotive industries, and the SAE from Automatically Guided Vehicles, show complete elimination or a significant decrease of jitter when compared to non-optimized systems.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131645352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Accounting for clock frequency variation in the analysis of distributed factory control systems 在分布式工厂控制系统分析中考虑时钟频率的变化
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-09-06 DOI: 10.1109/WFCS.2000.882533
W. Henderson, D. Kendall, A. Robson
{"title":"Accounting for clock frequency variation in the analysis of distributed factory control systems","authors":"W. Henderson, D. Kendall, A. Robson","doi":"10.1109/WFCS.2000.882533","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882533","url":null,"abstract":"Microcontrollers are now widely deployed as components in distributed systems. Temporal predictability is often important for such embedded systems-i.e., software must execute within specified time bounds to maintain safe operation of the system as a whole. Microcontroller clocks exhibit random variation in resonant frequency from one component to another, a temperature sensitivity and gradual changes with time. Thus, the execution speed of software will vary when implemented on different processors of the same class. We highlight the vulnerability of standard scheduling analysis in the presence of clock frequency uncertainty when applied to the performance prediction of distributed embedded systems. We propose a modified scheduling analysis to account for the inevitable range of processor clock rates in embedded distributed systems and confirm our analysis by an empirical study using a CAN for inter-processor communication.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129594485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
The static polytope and its applications to a scheduling problem 静态多面体及其在调度问题中的应用
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 2000-03-23 DOI: 10.1109/WFCS.2000.882560
ProblemK. Subramani, Ashok Agrawala
{"title":"The static polytope and its applications to a scheduling problem","authors":"ProblemK. Subramani, Ashok Agrawala","doi":"10.1109/WFCS.2000.882560","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882560","url":null,"abstract":"In the design of real-time systems, it is often the ease that certain process parameters, such as execution time, are not known precisely. The challenge in real-time systems design is to develop techniques that efficiently meet the requirements of impreciseness. Traditional models tend to simplify the issue of impreciseness by assuming worst-case times. This assumption is unrealistic and at the same time, may cause certain constraints to be violated at run-time. In this paper, we study the problem of scheduling a set of ordered, non-preemptive processes under non-constant execution times. Typical applications for variable execution time scheduling include process scheduling in real-time operating systems such as Maruti compiler scheduling, database transaction scheduling and automated machine control. An important feature of application areas such as robotics is the interaction between execution times of various processes. We explicitly model this interaction through the representation of execution time vectors as points in convex sets. We present both sequential and parallel algorithms for determining the existence of a static schedule.","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129291138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
2000 IEEE International Workshop on Factory Communication Systems Proceedings 2000 IEEE工厂通讯系统国际研讨会论文集
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 1900-01-01 DOI: 10.1109/WFCS.2000.882526
{"title":"2000 IEEE International Workshop on Factory Communication Systems Proceedings","authors":"","doi":"10.1109/WFCS.2000.882526","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882526","url":null,"abstract":"","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132526657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evolution potentials for fieldbus systems 现场总线系统的发展潜力
2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531) Pub Date : 1900-01-01 DOI: 10.1109/WFCS.2000.882544
D. Dietrich
{"title":"Evolution potentials for fieldbus systems","authors":"D. Dietrich","doi":"10.1109/WFCS.2000.882544","DOIUrl":"https://doi.org/10.1109/WFCS.2000.882544","url":null,"abstract":"The roots of fieldbus technology are mixed, both classical electrical engineering and computer science contributed their share to the evolution. Typical performance of different fieldbus technologies overlap more and more. Nevertheless striking characteristic features are taking shape. Although on one hand fieldbus technology has meanwhile established itself, on the other hand a large number of problems are still unsettled: the plain ISO/OSI model is no longer sufficient. We have to create new layers to obtain better interoperability. Furthermore, the dramatically increasing complexity of fieldbus applications demands scalable systems. The complexity together with high installation costs make simulations of fieldbus behavior a necessity. Essential driving forces for the development of new concepts come from the area of building automation: the need to reduce the costs of integrating and automating facility management systems, service costs, and the need to reduce energy consumption while at the same time improving its distribution (demand side management systems). The prioritization of real-time data transmission combined with Gigabit switching standards for LANs offers new possibilities. In order to achieve the goals of modern automation, new requirements have to be met: configurable interactions between different fieldbus systems, efficient wireless technologies to increase mobility and facilitate installation, but also plug & play features. A topic of increasing importance are the different possibilities for connections to IP-based LANs, which will partially replace conventional mid-level fieldbus systems. New concepts of implementation, tests and maintenance will make many of today’s concepts obsolete. The","PeriodicalId":112914,"journal":{"name":"2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531)","volume":"778 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114000243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 54
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