令牌目的循环时间对PROFI BUS测控周期的影响

Impact analysis of token target rotation time on message transaction cycle time in PROFIBUS system

在对PROFIBUS的令牌总线协议和系统的测控周期深入分析后,利用休假排队理论对PROFIBUS系统进行建模,从理论上研究了令牌目的循环时间T_(TR)对系统的测控周期的影响。说明了在一定范围内随着T_(TR)的增大,测控周期会随着增大,之后将不再变化。

Upon the detailed analyzes ofPROFIBUS＇ token-passing protocol, and the impact ofthe message transaction circle time, a queue model is built based on the PROFIBUS＇ token-passing protocol. The relationship between the target-token-rotation time TTR and the message transaction circle time is studied theoretically. In an area, the message transaction time increases with the rise of the TTR. When the TTR exceeds the area, the message transaction timestop increasing.