This paper studies ProfiNet communication between multiple S7-300 PLC in industry field. Every S7-300 PLC can control the other S7-300 PLC devices in real time,which is realized by using their own PN interface of CPU 315-2PN/DP. This scheme can meet the communication needs of the field level, greatly reduce the cost of installation, construction and commissioning, and increase the flexibility of the system.%本文对工业现场的多台S7-300 PLC之间的ProfiNet通信展开研究，使用其CPU 315-2PN/DP自身所带的PN接口，实现多台S7-300 PLC中的每一台都能实时的控制其他的几台。此方案能够满足现场层的通信需求，可以极大地降低安装、工程和投运的成本，增加系统的灵活性。
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