The time characteristics of cyclic service in Profibus

Author

Li, M. ; Stoeckli, L.

Author_Institution

Dept. of Comput. Eng., Swiss Federal Inst. of Technol., Lausanne, Switzerland

fYear

1996

fDate

15-16 Apr 1996

Firstpage

192

Lastpage

195

Abstract

In Profibus master stations poll data from slave stations using the cyclic service CSRD (Cyclic Send and Request Data with Reply). Because the polling-interval determines the data sampling interval, it is important for the Profibus user to be able to know the maximum polling-interval of a cyclic service. We develop a formula for determining the maximum polling-interval of a cyclic service. Furthermore, if the polling-interval of a cyclic service cannot be met, then we can repeat the corresponding cyclic service in a poll list to reduce the polling-interval. However, how are the repealed cyclic services to be positioned in the poll list? The approach we use is an equi-distance one

Keywords

computer interfaces; field buses; protocols; timing; CSRD; Cyclic Send and Request Data with Reply; Profibus; cyclic service; data sampling interval; field bus; master stations; maximum polling-interval; polling-interval; slave stations; time characteristics; Actuators; Context-aware services; Data communication; Data engineering; Feedback control; Field buses; Master-slave; Sampling methods; Sensor phenomena and characterization;

fLanguage

English

Publisher

ieee

Conference_Titel

Parallel and Distributed Real-Time Systems, 1996. Proceedings of the 4th International Workshop on

Conference_Location

Honolulu, HI

Print_ISBN

0-8186-7515-2

Type

conf

DOI

10.1109/WPDRTS.1996.557678

Filename

557678