調(diào)度策略是網(wǎng)絡(luò)控制系統(tǒng)中的一個(gè)重要問題。本文分析了常見調(diào)度算法的基本特點(diǎn)，并根據(jù)熱工自動(dòng)控制系統(tǒng)的要求提出了一個(gè)基于緊急度指標(biāo)（EI）的動(dòng)態(tài)優(yōu)先權(quán)調(diào)度算法，機(jī)理分析和仿真試驗(yàn)表明，此算法可以有效地提高總線利用率，保證系統(tǒng)的實(shí)時(shí)
性，防止數(shù)據(jù)丟失。
關(guān)鍵詞網(wǎng)絡(luò)控制系統(tǒng)調(diào)度算法現(xiàn)場(chǎng)總線
Abstract Scheduling strategy is a very important issue in Network Control Systems（NCS）. This paper analyses the scheduling algorithms used widely
and their features. In addition，a new scheduling algorithm with dynamic priority based on Emergence Index（EI）is presented for automatic process control.
Theoretical analysis and simulation show that by using this algorithm，the utilization ratio of the bus is enhanced effectively，the real-time performance
of the system is guaranteed，and data loss is prevented.
Key words Network control system Scheduling algorithm Fieldbus