噪音环境下的FFFieldbus通讯性能研究

通过噪音对令牌运行过程的作用 ,本文分析了在噪音环境下 FF Fieldbus的性能变化 .本文首先建立了令牌运行过程的自动机模型 ,然后利用此模型分析了噪音对令牌运行方式的影响 .根据噪音的影响 ,本文推导出令牌运行时间和令牌平均运行时间 .最后利用解析表达式分析出噪音分布对 FF Fieldbus性能的影响 .

In this paper, the performance degradation of FF fieldbus in noisy environment is analyzed through analyzing the effect of noises on token operation. Token mechanism is modeled by status machine, and detailed token operation under noisy environment is investigated through the stateus machine model. The mean token passing time and mean token rotation time are derived from the detailed token operation to evaluate the effect of noises on the performance of FF fieldbus. The analysis shows that the density of noise has a serious effect on the performance of FF fieldbus, and even tends to make FF fieldbus not meet the real  time requirement any more.

国家自然科学基金重大项目 !(5 9990 470 );;国家“九五”攻关项目!(97- 75 6 );;沈阳市基金!(1977_ B2 J0 13)