本规范适用于网络控制系统的通信协议。该协议为网络控制提供点对点通信，适用于实现点对点和主从控制策略。本规范描述了第2-7层中的服务。在第2层（数据链路层）规范中，它还描述了MAC子层与物理层的接口。物理层提供了传输介质的选择。本规范中描述的接口在物理层支持多种传输介质。在第7层规范中，它包括应用程序用来交换应用程序和网络管理数据的消息类型的描述。

This specification applies to a communication protocol for networked control systems. The protocol provides peer-to-peer communication for networked control and is suitable for implementing both peer-to-peer and master-slave control strategies. This specification describes services in layers 2-7. In the layer 2 (data link layer) specification, it also describes the MAC sub-layer interface to the physical layer. The physical layer provides a choice of transmission media. The interface described in this specification supports multiple transmission media at the physical layer. In the layer 7 specification, it includes a description of the types of messages used by applications to exchange application and network management data.