Fulfilling temporal constraints in fieldbus

Field busses are emerging as a replacement of direct connections from control systems to the process. Many proposals such as FIP, PROFIBUS, CAN, LONWOKS have been made to solve the interconnection problem. Some, like FIP and PROFIBUS, are national standards. However, the temporal requirements, as expressed by bodies like IEC, ISA, IEEE, CENELEC, ISO TCCA, IFC or European projects in the field, are not completely fulfilled by these proposals or not even addressed. In this paper, we first detail the temporal as well as spatial requirements among which consistency plays a key role. We then explain to which extent these requirements are addressed by the different proposals. This analysis shows that none of the proposals entirely fulfils them. We explain how the requirements can be satisfied within the network software, in a simple manner and adequate use of the FIP protocol even if this is not very efficient. Finally, we show the requirements may be satisfied in a simple and efficient manner.<<ETX>>

[1]  Guevara Noubir,et al.  Analysis of a Class of Polling Protocols for Fieldbus Networks , 1993, Decentralized and Distributed Systems.

[2]  Xiaohui Song,et al.  Performance of multiversion concurrency control algorithms in maintaining temporal consistency , 1990, Proceedings., Fourteenth Annual International Computer Software and Applications Conference.

[3]  K. H. Kim,et al.  Temporal uncertainties in interactions among real-time objects , 1990, Proceedings Ninth Symposium on Reliable Distributed Systems.

[4]  Hermann Kopetz,et al.  Event-Triggered Versus Time-Triggered Real-Time Systems , 1991, Operating Systems of the 90s and Beyond.

[5]  Guevara Noubir,et al.  A software architecture for maintaining temporal consistency in a distributed real-time environment , 1993, Proceedings of 1993 IEEE 17th International Computer Software and Applications Conference COMPSAC '93.

[6]  P. Pleinevaux,et al.  Time critical communication networks: field buses , 1988, IEEE Network.

[7]  J. P. Thomesse,et al.  The field bus application services , 1989, 15th Annual Conference of IEEE Industrial Electronics Society.

[8]  Hermann Kopetz,et al.  CONSISTENCY CONSTRAINTS IN DISTRIBUTED REAL TIME SYSTEMS , 1988 .

[9]  Jean-Dominique Decotignie,et al.  A survey on industrial communication networks , 1993 .

[10]  Jean Pierre Thomesse.  A Study Of LLC Services Implementations For A Field Bus , 1987, Other Conferences.

[11]  P. Raja,et al.  Characterizing Temporal Consistency In A Fieldbus Environment , 1992, Singapore International Conference on Intelligent Control and Instrumentation [Proceedings 1992].

[12]  Jean-Dominique Decotignie,et al.  Multicycle operations in a field bus: application layer implications , 1989, 15th Annual Conference of IEEE Industrial Electronics Society.

[13]  J. P. Thomesse.  Time and industrial local area networks , 1993, 1993 CompEuro Proceedings Computers in Design, Manufacturing, and Production.

[14]  Kwei-Jay Lin,et al.  Recovering imprecise transactions with real-time constraints , 1988, Proceedings [1988] Seventh Symposium on Reliable Distributed Systems.

[15]  Guevara Noubir,et al.  Synchronous model for Fieldbus applications , 1993, Proceedings of IECON '93 - 19th Annual Conference of IEEE Industrial Electronics.