面对为数众多的网络，如何选择、选择什么样的网络才能适合于现场的应用呢？系统集成专家认为，网络类型、应用场合、使用的设备、诊断功能及性能应优先考虑，而决策、设计、设备配置、网络诊断工具也是不容忽视的因素。用于控制系统的网络按其传输数据的方式可分为三类——传 In the face of a large number of networks, how to choose, what kind of network to choose for the site application? System integration experts believe that the type of network, applications, equipment used, diagnostic capabilities and performance should be given priority, and decision-making, design, equipment configuration, network diagnostic tools can not be ignored. The network used to control the system can be divided into three categories according to how it transmits data