OPC Feeds Data from PLC to DCS

土耳其的造纸厂使用KEPware Technologies的Linkmaster和Kepserverex OPC服务器将数据从西门子可编程控制器传输到ABB分布式控制系统。

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The Georgia Pacific paper mill in Yalova, Turkey, was faced with a few problems at the plant. In the water treatment portion, the paper plant was using a Siemens programmable logic controller (PLC) and needed to feed data into an ABB Advant OCS.

At first, the paper mill wanted to connect in a classic way, using Profibus to link the Siemens PLC to the ABB Advant OCS. This type of connection can be very costly and time consuming to set up. The Profibus connection has complex programming requirements, and the distributed control system controller, when connecting to a slave, had to restart itself. Restarting the DCS controller, which may have to be done multiple times, stops the mill production each time.

位于土耳其的OPC集成商和分销商ASP Otomasyon需要开发一种负担得起且健壮的解决方案,以遵守数据源的速率。凭借在造纸行业的多年经验,ASP Otomasyon通过应用Kepware Technologies的Linkmaster和Kepserverex OPC服务器与Siemens Controllers的插件驱动程序一起解决了这一问题。

纸厂将数据从PLC转移到DCS的要求是常见的,并且可以理解,因为DCS具有复杂的结构,并且操作员更喜欢观察和控制DCS中的每个项目。考虑到这一点,ASP部署了KEPSERVEREX应用程序,以读取西门子PLC的所有标签。然后,该公司将Linkmaster的使用纳入了将PLC数据链接到DCS。

Linkmaster提供了将数据从一个服务器应用程序桥接到另一个服务器的方法,并且不需要编程。相反,Linkmaster使用一种简单的“拖放”方法,该方法将创建链接,包括内置缩放,用户访问管理器,错误跟踪和写入优化功能,从而提供数据流和应用程序访问的全部控制。然后创建链接组以形成将以指定速率在OPC服务器之间移动的OPC项目的集合。

With multiple Link Groups, LinkMaster controls how fast data is transferred from one OPC server to another. By using Link Groups with different update rates, the data transfers can be tailored to the needs of the application. While one item may need to be sent at high speed, other items in the application may need slower update rates. The adjustable Update Rate in Link Groups can be used to reduce network traffic and increase reliability of the overall application.

During implementation of this project, ASP Otomasyon faced one problem:
当标签提供新信息时,Linkmaster在编写新值时将标签(在DCS上)保持标签。数据每秒都会更改,并且在数据发生变化时,标签和DC仍然参与。这导致操作员在数据交换发生时无法选择标签。

The problem was solved by creating and using new variables, which are then forwarded inside the DCS database. By doing this, the operator could reach the original tags while new tags were being read and written. The project was completed on time, within budget and is still working very well for the client.

Visit Kepware to read the fullLinkmaster OPC服务器解决方案.

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