摘要
为了满足在线分析仪器通信的实时性、可靠性要求,针对通信过程中容易出现的随机通信差错,如数据损坏和丢失、顺序错乱、传输延迟等问题,在应用层面对提高通信可靠性的一般措施进行了归纳,提出了特别适用于在线分析仪器的技术措施.在总线核心协议设计层面,从对错误位残差概率的分析入手,通过Monte Carlo仿真找到出错位数与残差的关系,提出了编码与校验位匹配、定长周期数据帧和帧长度的系统检查及时间戳的有效使用等提高通信可靠性的设计要点.
In accordance with the requirements of real time performance and reliability for communication of on-line analysis instruments,and the easily occurred random communication errors,such as data damage and loss,sequential disorder,transmission delay,etc.,the general measures for improving communication reliability in application layer are summarized,and the technical measures particularly suitable for on-line analysis instruments are proposed.On the design layer of nexus protocol of fieldbus,from the analysis on residuals probability of error bits,the relationship between the number of error bits and residuals is found through Monte Carlo simulation;thus the design points for improving reliability of communication,including encoding and CRC matching,fixed cyclic frame and length inspection,and time stamp in effective use,etc.,are proposed.
出处
《自动化仪表》
CAS
北大核心
2014年第S01期1-4,共4页
Process Automation Instrumentation
基金
国家高新技术研究发展计划(863计划)基金资助项目(2012AA040602)
关键词
在线分析
可靠性
现场总线
残差
曼彻斯特码
时间戳
On-line analysis
Reliability
Fieldbus
Residuals
Manchester code
Time stamp
