With the advancement of technology, automation instrument signal has been constantly improving from pneumatic signal ,voltage signal and standard current signal to digital signal.Oil refining enterprises need not only simple process parameters for testing and monitoring,but also some more detailed parameters.Sothe communication mode of HART communication protocol which has completeparameters and a simple formmakes a perfect solution to the field data collection and control function. This articledescribes the use of HART communication protocol in the field instruments through the practical application experience.%随着技术进步，自动化仪表信号的传输从气动信号、电压信号、标准电流信号，一直到数字通讯不断完善。石油炼化企业自动化仪表的使用除了简单的工艺参数检测和监控，还需要一些更详细的参数，于是HART通信协议这种形式简单参数齐全的通讯模式完美的解决了现场数据的收集和控制功能。本文通过现场的实际应用经验，阐述HART通信协议在现场仪表中的使用。
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