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IBS S7 400 DSC/I-T现货

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2、从系统结构来说:
PLC与DCS的基本结构是一样的。PLC发展到今天，已经全面移植到计算机系统控制上了，传统的编程器早就被淘汰。小型应用的PLC一般使用触摸屏，大规模应用的PLC全面使用计算机系统。和DCS一样，控制器与IO站使用现场总线（一般都是基于RS485或RS232异步串口通讯协议的总线方式），控制器与计算机之间如果没有扩展的要求，也就是说只使用一台计算机的情况下，也会使用这个总线通讯。但如果有不止一台的计算机使用，系统结构就会和DCS一样，上位机平台使用以太网结构。这是PLC大型化后和DCS概念模糊的原因之一。
3、PLC和DCS的发展方向:
小型化的PLC将向更专业化的使用角度发展，比如功能更加有针对性、对应用的环境更有针对性等等。大型的PLC与DCS的界线逐步淡化，直至完全融和。
DCS将向FCS的方向继续发展。FCS的核心除了控制系统更加分散化以外，特别重要的是仪表。FCS在国外的应用已经发展到仪表级。控制系统需要处理的只是信号采集和提供人机界面以及逻辑控制，整个模拟量的控制分散到现场仪表，仪表与控制系统之间无需传统电缆连接，使用现场总线连接整个仪表系统。(目前国内有横河在中海壳牌石化项目中用到了FCS,仪表级采用的是智能化仪表例如:EJX等，具备先进的控制水准)。
○如何正确对待PLC和DCS
我个人从不强调PLC和DCS之间孰优孰劣，我把它们使用了一个新名词“控制类产品”。我们提供给用户的是适合用户的控制系统。绝大多数用户不会因为想使用一套DCS而去使用DCS，控制类产品必须定位在满足用户的工艺要求的基础之上。其实提出使用DCS还是PLC的用户大抵是从没接触过自控产品或有某种特殊需求的。过分强调这个东东只会陷入口舌之争。
从PLC与DCS之间的区别和共同之处我们了解了控制类产品的大抵情况。注意，作为专业人士，我们自己不要为产品下PLC还是DCS的定义，自己的心理上更不能把产品这样来区别对待。

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AMETEK 1726 Digital Tachometer
Ametek U.S. Gauge Pneumatic Pressure Controller With Wall Mount
AMETEK T-730 Pneumatic Pressure Tester, 0 - 30" PSI
Ametek / Wika Pressure Gauge w/ Diaphragm 0-700 kPa
Ametek Pressure Gauge w/ Diaphragm 0-100 psi 4-1/2"
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AMETEK MANSFIELD & GREEN M&G SC-1-300 THERMAL SENSOR
Ametek USG Pressure Gauge 132785 929
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AMETEK DREXELBROOK 700-0201-005 SENSING ELEMENT
Ametek: Drexelbrook VeriGap Sensor 404-1000 Nice!
Ametek USG Vacuum Gauge 132789 Type 1929
Ametek Lamb 7.2" Vacuum Motor 115330 NEW
AMETEK DREXELBROOK 700-202-2 0202-002 SENSING ELEMENT - NEW/UNUSED SURPLUS
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AMETEK RIS ISOLATED TRANSMITTER SC-1302 4-20 mADC NEW
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IBS S7 400 DSC/I-T

USG AMETEK SS RC1 150 PRESSURE GAUGE , 1500PSI
AMETEK TRIM-Series Model T-44N .8 Newton/Divison Force Gage
Genuine Ametek Lamb Motor 1 Stage 5.7 Replaces 116309 116309-00 119400,119400-?00
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IBS S7 400 DSC/I-T

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American Optical Child Vision Acuity Chart Projector Slide Optometry Ophthalmic
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IBS S7 400 DSC/I-T