CE3008 KJ2005X1-MQ1 12P6381X042  运行控制DCS系统设备行业
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CE3008 KJ2005X1-MQ1 12P6381X042  运行控制DCS系统设备行业这两种体系结构之间的差异并不大。两者都有一个CPU卡（控制器模块）和一个带I/O模块的I/O子系统。在过去，PLC是纯逻辑的，DCS是纯连续控制器。PLC在梯形图中编程，DCS在功能块中编程。如今，两者都可以处理各种I/O，并且可以用多种语言编程。在过去，DCS包括服务器和工作站软件，而对于PLC，HMI软件是单独购买的。即使用DCS是一个集成系统，而PLC是一个系统集成。在过去，分布式控制系统只使用专有网络，而可编程逻辑控制器使用开放网络，从而可以连接第三方硬件。在过去，只有DCS应用程序是专有的，而PLC是一个开放系统。也就是说，对于DCS，所有应用程序都是为本地硬件量身定制的，大限度地减少了配置工作，但使其不可能或从第三方添加硬件和软件是不可行的。PLC可以自由使用第三方硬件和软件，需要大量的配置工作，但至少这是可能的。如今，PLC使用OPC将数据作为一个单一的集成数据库提供给软件，几乎没有重复工作。同时，DCS还将OPC作为一个网关，使访问某些数据成为可能，尽管仍然无法选择。但我使用的PLC可以完全操作一个25 MGD以上的水厂，几乎没有或根本没有操作员交互，除了通过主SCADA计算机进行少量监控和内务管理。从你两个相当长的解释中，我看不出有什么真正的区别。再加上两者是如此的相互关联和融合，很难得出明确的定义差异。此外，我可以使用一个具有大量I/O扩展功能的PLC来处理水厂中的所有过滤器，甚至处理水厂的其他操作，而不是购买单独的控制器来做同样的事情——对于计数器来说，我知道这是一个真正的省钱方法，当考虑到水厂寿命内的操作成本与设备成本时。尽管许多人会认为存在显著的差异和成本优势等，我站在支持两者的平台上。两者非常相似，都可以执行另一个的功能，并且可以集成为一系列工厂自动化方案提供解决方案。
workstation software and you still cannot connect third party devices to the DCS networking. These days most PLC manufactures have either bought or aligned themselves with HMI software companies supplying a total solution. Other differences in that past included far better diagnostics and redundancy in the DCS, but this gap has been closed. Today, many PLCs are sold as and used in applications where in the past only DCS could be used. Historically a DCS was also far more expensive, but the competition from PLC and new architectures have driven the initial price of DCS down although the long term cost may be higher since with a DCS you are pretty much locked to a single supplier.In both cases the PLC or controller is sperately programmed and if programmed correctly can operate completely on its on and even share required data with other devices (PLCs, PCs, controllers...) and in each case the controllres or PLCs or PCs could send data to a host computer which provides overall operator interface, alarming, historical trending and such... you could even have local HMIs where you need them.In fact if you had twenty PLCs each programmed to perform a plant function and only send data to a HMI or SCADA computer would this not be a DCS system - the control operations are indeed distributed among the various PLCs, the PLCs do indeed function on their own and are not dependent upon a host computer to tell them wha to do or when to do it. Is this not the basis of a DCS scheme? Also, the PLCs could share data with the other PLCs so they could act upon the information obtained to adjust their given function.

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We currently stock over 100+ branded products.
---ABB: AC800M/DSQC/Bailey INFI 90
---Bently Nevada:3500/3300 system
---GE:IC693/IC695/IC697/IC698/IC200/IC660/IC670/IS200/DS200 series
---Honeywell:TDC 2000/TDC3000/TPS/Security systems
---Schneider:Quantum 140 series
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---Woodward:505/505E(9907-162,9907-164, 9907-165, 9907-167) 9905/2301D-ST series
---Yokogawa:CS3000 system
---Konrad:EC6423/ EC6424/ EC6426/ EC6430/ EC6432/ EC6433/ EC20382/MMS7000 series
---Allen-Bradley:1747/1746/1761/1763/1762/1766/1764/1769/1768/
1756/1789/1794/1760/1788/1771/1785 series
---Epro:PR6422/PR6423/PR6424/PR6426/PR9268/MMS6000system
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