woodward 9907-005

woodward 9907-005

woodward 9907-005

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　2 三大控制系统之间的差异

　　2.1 差异

　　2.1.1 DCS或PLC

　　PLC系统与DCS系统的结构差异不大，只是在功能的着ZD上的不同，DCS着重于闭环控制及数据处理。PLC着重于逻辑控制及开关量的控制，也可实现模拟量控制。

　　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。数据公路的媒体可以是：一对绞线、同轴电缆或光纤电缆。

　　DCS的特点是：

（1）控制功能强。可实现复杂的控制规律，如串级、前馈、解耦、自适应、zui优和非线性控制等。也可实现顺序控制。

（2）系统可靠性高。

（3）采用CRT操作站有良好的人机界面。

（4）软硬件采用模块化积木式结构。

（5）系统容易开发。

（6）用组态软件，编程简单，操作方便。

（7）有良好的性价比。

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