DNP3（分布式网络协议）是一组在过程自动化系统组件之间使用的通信协议。它的主要用途是在公共事业如电力和自来水公司。用法在其他行业是不常见的。它是为不同类型的数据采集和控制设备之间的通讯而设计的。它在SCADA系统中起着至关重要的作用，它是通过使用SCADA主站（又名控制中心），远程终端单元（RTU）和智能电子设备（IED）。它主要用于一个主站和RTU或IED之间的通信。（符合IEC60870-6的一部分），用于跨主站通信。-DNP3 (Distributed Network Protocol) is a communication protocol between the system components used in process automation. Its main use is in utilities such as electricity and water companies. Usage in other industries is not common. It is intended for communication between different types of data acquisition and control devices and design. It plays a vital role in the SCADA system, it is through the use of SCADA master station (also known as the control center), remote terminal unit (RTU) and Intelligent Electronic Devices (IED). It is mainly used for communication and a master between RTU or IED. (In line with part of the IEC60870-6), the main station for inter-communication.