工業控制網絡對網絡的實時性要求很高，不僅要求傳輸速度快，數據傳輸還要具有確
定性。以太網的通信存在不確定性，不能滿足實時性要求，成為以太網應用于工業控制領域的主要障礙。本設計實現的實時以太網［2］就是網絡中每個節點的通信被嚴格地限定在規定時間內，確保在同一網段內同時只有一臺在發送數據。
關鍵詞：工業以太網；確定性；調度；實時
Abstract: Industrial control net is a special applicative network, it demands high desired real time processing and deterministic. Non-deterministic communication of ethernet which can't meet the real time demand of industrial control has become a main obstacle in application on filed device layer network. Real-time Ethernet implemented in this design is to build a high speed , deterministic network over traditional Ethernet . The communication among work stations is limited in deterministic time intervals , which guarantte that only one node can send datas in a certain time.
Key words: Industrial Ethernet ; deterministic ; scheduling ; real-time