实时以太网控制系统的功能块执行方法  

Function Blocks Executing Method in Control Systems Based on Real-Time Ethernet

作　　者：刘宁[1] 仲崇权 薛铜龙[1] LIU Ning;ZHONG Chongquan;XUE Tonglong(School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;Faculty of Electronic Information and Electrical Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)

机构地区：[1]河南理工大学机械与动力工程学院,河南焦作454000 [2]大连理工大学电子信息与电气工程学部,辽宁大连116024

出　　处：《计算机工程与应用》2019年第13期112-118,128,共8页Computer Engineering and Applications

基　　金：国家科技支撑计划(No.2015BAF20B02);河南省高等学校重点科研项目(No.17A413006)

摘　　要：为了提高实时以太网控制系统的运行效率和通信性能,在EPA(Ethernet for Plant Automation)确定性通信调度的基础上提出了一种功能块执行方法。该方法将现场设备中所有需要远程通信的功能块整合为功能任务,并且按照功能块执行与数据通信周期同步的原理确定了功能任务的执行规律:功能任务在单个通信宏周期中只能单次执行,当周期报文空窗期满足功能任务执行需求时,功能任务在周期报文传输任务结束时执行;当周期报文空窗期不能满足功能任务执行需求时,功能任务在非周期报文传输任务结束时执行。实验证明,该方法实现了系统中功能任务与通信任务的周期同步,避免了功能块的无效执行与数据的无效传输,提高了系统的运行效率和通信性能。A functions blocks execution method is proposed on the base of EPA deterministic scheduling mechanism to improve the operation efficiency and the communication performance of EPA(Ethernet for Plant Automation)real-time ethernet systems. The method integrates all the function blocks which need EPA communication in an EPA device into a function task and determines the execution rule of the function task according to the period synchronization principle between the function blocks execution and the data communication in EPA systems:the function task must be executed only once in a macro cycle, if the periodic messages transmission window period is enough for the execution of the function task, the function task will be executed when the periodic messages transmission task is completed;if the periodic messages transmission window period is not enough for the execution of the function task, the function task will be executed when the nonperiodic messages transmission task is completed. The experiments prove that the method can accomplish the synchronous implementation between the function task and the communication task, and consequently can improve the operation efficiency and the communication performance of EPA systems.

关 键 词：实时以太网 控制系统 通信性能 功能块 

分 类 号：TP393.1[自动化与计算机技术—计算机应用技术]