ECN0601AAA

ECN0601AAA

ECN0601AAA

ECN0601AAA

4.1 现场总线集成在DCS的I/O总线上   
这种方式通过接口卡直接将现场总线集成到DCS系统中。与I/O功能块相关的测量值和设定值可以通过接口卡映射成I/O总线上等价的值。通过这种映射关系，DCS就能透明地获取现场总线智能仪表传送的信息，其效果和传统的变送器相同。   
这种集成方式的优点:   
l 只需安装现场总线接口卡 ，无需改变或升级DCS系统。   
l 对于一些初级的现场总线设备，厂家提供的功能块有限，这种方式保留了DCS的控制功能。   
l 采用低成本的PC作为现场总线组态、诊断的接口单元。   
但这种方式也限制了DCS所能获取的信息，无法利用现场设备中大量的状态信息。

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