| 型号 : | IC200MDL743 | 品牌 : | GE/通用电气 |
| 加工定制 : | 否 | 产品认证 : | 已认证 |
| 输出频率 : | 2220kHz | 工作电压 : | 220V |
IC200MDL743
IC200MDL743
IC200MDL743
IC200MDL743
不同的机构和不同的人可能对现场总线有着不同的定义，不过通常情况下，大家公认现场总线的本质体现在以下六个方面：
l 现场通信网络
用于过程自动化和制造自动化的现场设备或现场仪表互连的现场通信网络。
《联系人；欧先生》
《座机：0592-5709825》
《传真：0592-5917519》
《24小时热线：18030229053微信同步》
《QQ ：2479261344》
《QQ邮箱：2479261344@qq.com》
l 现场设备互联
依据实际需要使用不同的传输介质把不同的现场设备或者现场仪表相互关联。
l 互操作性
用户可以根据自身的需求选择不同厂家或不同型号的产品构成所需的控制回路，从而可以自由地集成FCS。
l 分散功能块
FCS 废弃了DCS 的输入/输出单元和控制站, 把DCS 控制站的功能块分散地分配给现场仪表, 从而构成虚拟控制站，彻底地实现了分散控制。
l 通信线供电
通信线供电方式允许现场仪表直接从通信线上摄取能量, 这种方式提供用于本质安全环境的低功耗现场仪表, 与其配套的还有安全栅。
l 开放式互联网络
现场总线为开放式互联网络，既可以与同层网络互联，也可与不同层网络互联，还可以实现网络数据库的共享。
从以上内容我们可以看到，现场总线体现了分布、开放、互联、高可靠性的特点，而这些正是DCS系统的缺点。DCS通常是一对一单独传送信号，其所采用的模拟信号精度低，易受干扰，位于操作室的操作员对模拟仪表往往难以调整参数和预测故障，处于“失控”状态，很多的仪表厂商自定标准，互换性差，仪表的功能也较单一，难以满足现代的要求，而且几乎所有的控制功能都位于控制站中。FCS则采取一对多双向传输信号，采用的数字信号精度高、可靠性强，设备也始终处于操作员的远程监控和可控状态，用户可以自由按需选择不同品牌种类的设备互联，智能仪表具有通信、控制和运算等丰富的功能，而且控制功能分散到各个智能仪表中去。由此我们可以看到FCS相对于DCS的巨大进步。
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Fisher Rosemount Pressure Transmitter 2088 G2A22A1B4
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