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《Electric Drive》 2005-11
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Cyclic Services in Profibus

Zhu Guanglei He Jinghan  
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 profibus user to be able to know the maximum polling-interval of a cyclic service.In this paper 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 the repeated cyclic service to be positioned in the pool list? The approach we use is an equi-distance one.
【CateGory Index】: TP273.5;
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