IP multicast technology is introduced and its communication mode in SCADA system is discussed. With a communication middleware designed,the message receiving and retransmitting mechanism is established to ensure the real-time and reliable communication.

• 在介绍IP组播技术的基础上,论述了组播技术在SCADA系统中的通信方式,设计一个组播通信中间件,建立报文接收和重传机制,确保信息收发的实时性、可靠性。