Abstract: Some kinds of communication errors occur during the communication process of fieldbus. Applying functional safety on the fieldbus technology can eliminate some of these errors. This paper describes Ethernet for Plant Automation(EPA) functional safety communication model. Several measures are used to detect different communication errors, such as time stamp, sequence number and CRC. The message structure of EPA functional safety protocol layer is presented. The realization process of functional safety protocol layer is depicted.

Key words: fieldbus, functional safety, Ethernet for Plant Automation(EPA) standard

摘要： 现场总线在通信传输过程中，会受到各种通信故障的影响，而现场总线与功能安全的结合可降低这种影响。该文描述EPA功能安全通信模型，针对通信传输过程中可能出现的通信错误，采用时间戳、序列号、CRC校验等功能安全通信技术。给出EPA功能安全协议层的报文结构，阐述功能安全协议层的具体实现过程。

关键词: 现场总线, 功能安全, EPA标准

CLC Number: 

• TP309