FF现场总线系统之链路活动调度器功能分析

摘要

链路活动调度器（LAS）是FF总线协议中数据链路层的核心，本文分析了LAS的基本功能，有助于更好地了解FF现场总线系统的通讯体系．%The LAS is the kernel of the data link layer in the FF filedbus protocal. The fundamental functionality of the LAS is analyzed in this paper to benefit the better understanding of the communications architecture of the FF fieldbus systems.