中文摘要：

为实现多媒体数据在EPA中的确定性传输，在研究EPA通信调度原理的基础上，分析多媒体数据在EPA通信宏周期传输的可行性以及分片重组原理，设计多媒体数据在周期时间片的传输调度模型，以及基于链表插入方法的分片数据报重组算法。针对目前多数多媒体设备未集成EPA协议栈，无法直接参与EPA现场层调度的问题，搭建接入多媒体数据的EPA网络测试平台。实验结果表明，在不干扰控制数据传输的情况下，基于EPA的多媒体数据传输延时为30ms-36ms，满足可接受延时小于130ms的要求，延时抖动在4ms以内，图像清晰流畅，从而验证了将多媒体数据接入EPA网络确定性传输的可行性。

英文摘要：

In order to achieve the deterministic transmission of multimedia data in Ethemet for Plant Automation（EPA）, this paper analyzes the feasibility of the multimedia data transmit on EPA communication macro cycle and the principle of IP fragment reassembly based on the study of EPA communication scheduling principle. It designs transmission scheduling model of multimedia data in cycle time slice, and a reassemble algorithm of the slice datagram based on linked list insertion method. Aiming at the problem that the most multimedia device can not integrate EPA protocol stack on the market and participate in schedule EPA field layer, it constructs EPA network test platform of accessing multimedia data. Experimental results show that with the case of no disturbance to control data, multimedia data transmission delay based on EPA is 30 ms-36 ms, it can satisfy the acceptable delay-time of 130 ms, delay jitter less than 4 ms, the image is clear and smooth, and the feasibility of multimedia data deterministic transmit on EPA is examined.