摘要
介绍了非立即无数量约束低优先级报文传送模式在持有令牌时间内的处理流程.基于报文周期时间对Profibus-DP的时态特性进行分析,讨论了不同数据传输率下的标准周期和非周期报文对标准周期的影响,进一步确定了目标令牌循环时间的下界,并给出了设置方法.
The FDL access mechanism and the message handling flow diagram of the unimmediate unconstrained low-priority traffic profile are analyzed. Based on several time conceptions, the temporal characteristics of Profibus-DP are discussed. The model of the standard real token rotation time without acyclic information is established. Impact on the standard token rotation time, which is deduced from acyclic information including diagnostic informations and acyclic read/write informations, is presented under different baudrates. Lower bound of target token rotation time in Profibus-DP is given as well as the setup method of target token rotation time.
出处
《控制与决策》
EI
CSCD
北大核心
2005年第3期337-340,共4页
Control and Decision
基金
国家自然科学基金项目(60274002).
