【摘要】 在PROFIBUS中,主站使用循环服务-CSRD(带应答的循环发送请求)轮询所有的从站。由于轮询的时间间隔决定采样时间,因此了解循环服务的最大轮询间隔时间对PROFIBUS用户来说是十分重要的。计算出一种判断循环服务最大轮询间隔时间的公式,如果周期服务的轮询间隔时间不能确定时,可以在一个轮询表中重复响应的周期服务以减少轮询间隔时间。为解决在轮询表中放置重复的周期服务的问题,使用等距离法。更多还原

【Abstract】 All the slave stations are polled by master stations with the cyclic service-CSRD(Cyclic Send and Request Data with Reply). since the data sampling interval is determined by polling-interval,so it is important for Profibus user to be able to know the maximum polling-interval of a cyclic service. A formula for determining the maximum polling-interval of a cyclic service is developed. Furthemore,if the polling-interval of a cyclic service cannot be met,then can repeat the corresponding cyclic service in a poll list to reduce the polling-interval. An equi-distance method is used for solving the problem.更多还原