Title :
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
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 However, how are the repealed cyclic services to be positioned in the poll list?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;
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
DOI :
10.1109/WPDRTS.1996.557678
