基于CAN总线的PLC通信技术的研究

摘要

If CAN bus can convert with PPI protocol,then the intelligent nodes on the CAN bus can access S7-200 se-ries PLC,thus realizing the data communication between different networks.In this paper,the realization of the hardware design scheme of PPI protocol and CAN protocol is researched.The PPI interface circuit and CAN interface circuit are de-signed.The CAN application layer protocol is analyzed.The whole software structure and operation is analyzed.Finally,the conversion protocol is tested.%CAN总线如果能与PPI协议进行转换,那么CAN总线上的智能节点便能访问S7-200系列PLC,从而实现异型网络间的数据通信.论文对实现PPI协议与CAN协议的硬件设计方案进行研究,对PPI接口电路和CAN接口电路进行设计,分析了CAN应用层协议,对整体软件结构和运行进行分析,最后对转化协议进行测试.