品牌:其他 | 规格:MCR-PT100/I/DC | 材质:MCR-PT100/I/DC |
产地:美国 |
MCR-PT100/I/DC
MCR-PT100/I/DC
MCR-PT100/I/DC
DD能够认为是装置的一个驱动器,它包括所有必要的参数描述和主站所需的操作步骤。由于DD包括描述装置通信所需的所有信息,并且与主站无关,所以可以使现场装置实现真正的互操作性。
实际情况是否如上述一致,回答是否定的。目前通过的现场总线国际标准含8种类型,而原IEO国际标准只是8种类型之一,与其它7种类型总线的地位是平等的。其它7种总线,不论其市场占有率有多少,每个总线协议都有一套软件、硬件的支撑。它们能够形成系统,形成产品,而原IEC现场总线国际标准,是一个既无软件支撑也无硬件支撑的空架子。所以,要实现这些总线的相互兼容和互操作,就目前状态而言,几乎是不可能的。
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