这部分扫描是用来处理来自任选智能模块(例如PCM)的通讯请求(见流程图)。扫描按照“先来先扫描”的原则服务于请求。然而,由于智能任选模块是按照循环方式通讯的,没有一个智能任选模块具有超越任一其它智能任选模块的优先权。在缺省RUN-TO-Completion方式下,系统通讯窗口的长度限定为50ms。如果一智能任选模块发出的请求处理超过50ms时,则请求处理将经过多次扫描,于是,没有一次扫描会因大于50ms而被压缩。
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