Konferenzbeitrag
Implementing function block adapters
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Text/Conference Paper
Dateien
Datum
2001
Autor:innen
Zeitschriftentitel
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Quelle
OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2
Regular Research Papers
Verlag
Gesellschaft für Informatik e. V.
Zusammenfassung
Function Block Adapters (FBAs) are new modeling elements, responsible for the connection of UML capsules and function blocks of the IEC 61131-3 standard. FBAs contain an interface to capsules as well as to function blocks and a description of the mapping between these interfaces. In this paper we discuss implementation issues of FBAs. While the specification of FBAs is completely platform-independent, we show that different hardware solutions force highly platform-dependent implementation models. In most cases a FBA is implemented in two programming languages - an object oriented language and a language out of IEC 61131-3. While object oriented programs mostly implement an event-driven execution semantic, PLC programs are executed cyclically. Especially this heterogeneous implementation environment was the motivation for developing Function Block Adapters.