核电仪控系统内数据下装与校验方法的研究

摘要

In the process of the maintenance of nuclear power control system,it is necessary to download data in controllers to complete the calibration and upgrade of the engineering configuration. In order to guarantee the completeness and accuracy of the data downloaded,the composition characteristics of the local area network ( LAN) communication node in nuclear power control system are studied. The existing LAN communication methods are investigated,and the data downloading and checking method based on IEEE 802. 3 protocol is put forward. Firstly,through designing functional instructions and presetting error notification to ensure the errors in communication process can be obtained by the system promptly. Then,a new data frame format based on MAC frame format is designed, through encapsulating the functional codes and error notification instructions to ensure interactivity among communication nodes. Finally,a series of measures are adopted,such as data packet CRC check,file CRC check and file read back comparison,to ensure the correctness of the file transmission in the LAN. After testing,the advantages of this method are revealed,e. g. ,higher reliability,fast transmission speed and lower configuration requirement,etc. The method can be widely used in LAN systems consisting more embedded modules,such as ship and thermal power.%在核电仪控系统的维护过程中,需要对控制器进行数据下装来完成工程组态的校验与升级.为了保证数据下装的准确性与完整性,对核电仪控系统内局域网(LAN)通信节点的组成特征进行了研究.对现有的局域网通信方法进行了分析,提出了一种基于IEEE 802.3协议的数据下装与校验方法.首先,通过设计功能指令以及预设错误通知,保证系统能够及时获取局域网通信过程中出现的错误;然后,基于MAC帧格式,设计了一种新的数据桢格式,通过封装功能码以及错误通知指令来保证通信节点之间的交互性;最后,采用数据包CRC校验、文件CRC校验以及文件回读比较等一系列方法,保证文件在局域网内传输的正确性.经过测试,该方法具有可靠性高、传输速度快以及配置要求低等优点,可以广泛应用于船舶、火电等嵌入式模块较多的局域网系统.