OPC shortcomings?

Sheble, Nicholas
June 2004
InTech;Jun2004, Vol. 51 Issue 6, p63
This article focuses on the problem encountered by Azimut-Solutions on the linking of operator interface stations at two pipeline terminals using object linking and embedding for process control (OPC) over a corporate wide-area network to facilitate consolidated operations of the facilities. During the course of the project, the company ran into several problems that highlight difficulties in the implementation of OPC on industry-standard Windows operating systems. While working through the problems encountered on the project and spending considerable time consulting with the vendor, the impression is that there is an almost disconnect between the application sitting on top of the OPC/Windows-based system and the low level communications resources from a communication control and diagnostic perspective. Third party tools must be used to observe what is going on within the communication system and from a diagnostic perspective, there is no ability to link a specific communication request from application to communication events occurring within the communications subsystem. A second result of the disconnect between the application and the communications system is the inability to exercise any control over the system.


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