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DCS的关键是通信。也可以说数据公路是分散控制系统DCS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体的灵活性和安全性。数据公路的媒体可以是:一对绞线、同轴电缆或光纤电缆。
通过数据公路的设计参数，基本上可以了解一个特定DCS系统的相对优点与弱点:
(1) 系统能处理I/O信息
(2) 系统能处理与控制有关的控制回路的信息
(3) 能适应用户和装置(CRT、控制站等)
(4) 传输数据的完整性是怎样检查的
(5) 数据公路的大允许长度是
(6) 数据公路能支持支路
(7) 数据公路是否能支持有其他制造厂生产的硬件(可编程序控制器、计算机、数据记录装置等)。
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