2711P-T12W22A9P
2711P-T12W22A9P
产品价格:¥0(人民币)
  • 规格:2711P-T12W22A9P
  • 发货地:厦门
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  • 最小起订量:1台
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    会员级别:钻石会员
    认证类型:企业认证
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    商铺名称:福建石屹科技有限公司

    联系人:张皓(先生)

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    企业邮箱:15765926@qq.com

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    商品详情

      DCS系统由多台计算机分别控制生产过程中多个控制回路,同时又可集中获取数据、集中管理和集中控制的自动控制系统。分布式控制系统采用微处理机分别控制各个回路,而用中小型工业控制计算机或高性能的微处理机实施上一级的控制。
      ??经过这些年来的不断应用,DCS系统在行业发展的一些局限性逐步体现出来,DCS存在的问题:
      ??①1对1结构。1台仪表,1对传输线,单向传输1个信号。这种结构造成接线庞杂、工程周期长、安装费用高、维护困难。
      ??②可靠性差。模拟信号传输不仅***度低,且易受干扰。为此采用各种措施提高抗干扰性和传输***度,其结果是增加了成本。
      ??③失控状态。操作员在控制室既不了解现场模拟仪表的工作状况,也不能对其进行参数调整,更不能预测事故,导致操作员对其处于失控状态。因操作员不能及时发现现场仪表故障,而发生事故已屡见不鲜。
      ??④互操作性差。尽管模拟仪表已统一4~20mA信号标准,可大部分技术参数仍由制造商自定,致使不同品牌仪表无法互换。因此导致用户依赖制造厂,无法使用性能价格比***的配套仪表,甚至出现个别制造商垄断市场的局面WOODWARD SPEED AND PHASE MATCHING SYNCHRONIZER SEVERAL MODELS AVAILABLE

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      FREE 2 YR WARRANTY FREE US SHIPPING ON ORDERS OVER $100
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      Euro Car Parts - The UK’s Largest Parts Distributor
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      9905-096 WOODWARD AUTOMATIC GENERATOR LOADING CONTROL--SA
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      New Genuine WAI Starter Motor 17720R Top Quality 2yrs No Quibble Warranty
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