OPC - Making the Fieldbus Interface Transparent
The performance of fieldbus systems has been studied more or less thoroughly. With the advent of high speed fieldbus systems as PROFIBUS-DP the bottleneck of systems moves from the communication to the application, especially to the interface between both. Two requirements are placed on such interface in general. First it should be based on an open, accepted standard where secondly it should support real-time operation. As the PC becomes more and more important even in the realm of industrial automation the quality of interfaces based on Microsoft Windows technologies gains importance too. The first solution provided with Windows 3.1 was the Dynamic Data Exchange (DDE). Although an open an finally widely accepted standard its communication performance was not satisfactory. The development of the OPC (OLE for Process Control) architecture aimes at solving the question of performance while providing an open interface standard between applications. Although the openness of this solutions is not debatable, the performance issue has to be investigated. This paper contributes to this by exploring the performance of an implementation of the OPC interface standard.
KeywordsProcessor Load Additional Workload Cyclic Data Concentrate Application SCADA System
Unable to display preview. Download preview PDF.
- 1.Brockschmidt, K: Inside OLE, Microsoft Press, Redmond, 1995.Google Scholar
- 2.Burke, Th. J.: The Performance and Throughput of OPC — A Rockwell Software Perspective, White Paper, Rockwell Software Inc., 1998.Google Scholar
- 3.Microsoft-NT Workstation Resource Kit, Microsoft Press, Redmond, 1997.Google Scholar
- 4.MSDN Library January 1999 release, Microsoft Corp., 1999.Google Scholar
- 5.OLE for Process Control — Data Access Standard V1.1, OPC Foundation, 1997.Google Scholar
- 6.Rogerson, D.: Inside COM, Microsoft Press, Redmond, 1997.Google Scholar
- 7.Schnittstellen zum Prozeβleitsystem, Draft, GTM, 1998.Google Scholar
- 8.UNIX System Manager’s Manual.Google Scholar
- 9.Wedekind, H.: Verteilte Systeme, Grundlagen und zukünftige Entwicklung aus der Sicht des Sonderforschungsbereichs 182 “Multiprozessor-und Netzwerkkonfigurationen”; BI Wissenschaftsverlag, 1994.Google Scholar