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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 link activity scheduler (LAS) is the core of the data link layer in the FF bus protocol. This document analyzes the basic functions of the LAS and helps to better understand the communication system of the FF fieldbus system.