The communication network connects the process station and the HMI into a system.There are several different types of structures for communication networks.Such as bus,ring and star.The bus shape is also logically circular.The star is only suitable for small systems.Whether it is a ring or a bus,broadcast is generally used.Some other protocols have been used less.The speed of the communication network is around 10M and 100M.
通讯网络把过程站和人机界面连成一个系统。通讯网络有几种不同的结构行式。如总线式、环形和星形。总线形在逻辑上也是环形的。星形的只适用于小系统。不论是环形还是总线形,一般都采用广播式。其它一些协议方式已用的较少。通讯网络的速率在10M和100M左右。
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