摘要： 为提高CAN 测控网络的适应性和通信效率,以CAN2. 0A 技术规范为基础,针对流程加工测控网络的特点,设计面向流程加工领域的CAN 总线应用层协议ProCAN。在明确流程加工概念及范围的基础上,分析流程加工测控系统结构模型的特征,提出通信报文的类型,定义标准数据帧仲裁域与数据域的编码格式,并讨论ProCAN 协议的通信模式、通信状态、通信异常及长报文误帧重传控制。利用OPNET 网络仿真软件进行实验,结果表明, ProCAN 协议能实现报文通信,并且具有延时短、实时性强、可靠性高的特点,尤其当网络负载较大时,效果更为明显。
关键词:
CAN 总线,
应用层协议,
控制网络,
流程工业,
通信模式
Abstract: In order to improve the adaptability and the communicative efficiency of CAN control network,the ProCAN
in the field of process industry is designed,which is based on the technical specification of CAN2. 0A and the features of machining process control network. This paper analyzes the features of machining process control system structure model, and proposes the types of communication messages,defines the coding of the standard data frame arbitration field and data field. Meanwhile,the communication model,the control of communication state network,the abnormal communication and the long packets retransmission of error frames for ProCAN protocol are discussed. By using OPNET network simulation software,simulation experiments show that the ProCAN protocol is able to achieve message communication with characteristics of low time delay,strong real-time capacity,high reliability,especially when the network is overload.
Key words:
CAN bus,
application layer protocol,
control network,
process industry,
communication mode
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