西门子 6ES5 318-8MB12
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DCS
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总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) 系统能处理多少I/O信息
(2) 系统能处理多少与控制有关的控制回路的信息
(3) 能适应多少用户和装置(CRT、控制站等)
(4) 传输数据的完整性是怎样***检查的
(5) 数据公路的允许长度是多少
(6) 数据公路能支持多少支路
(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)。
为***通信的完整，大部分DCS厂家都能提供冗余数据公路，为了***系统的安全性，使用了复杂的通信规约和检错技术。所谓通信规约就是一组规则，用以***所传输的数据被接收，并且被理解得和发送得数据一样。
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地址：厦门思明区湖滨东路湖光大厦8楼B
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