【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．更多还原

【Abstract】 The LAS is the kernel of the dare 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.更多还原