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The key to a DCS or PLC system is communication.It can also be said that the data highway is the backbone of the distributed control system DCS and PLC.Since its task is to provide a communication network between all components of the system,the design of the data highway itself determines the overall flexibility and security.

DCS或PLC系统的关键是通信。也可以说数据公路是分散控制系统DCS及PLC的脊柱。由于它的任务是为系统所有部件之间提供通信网络，因此，数据公路自身的设计就决定了总体的灵活性和安全性。