Plant Object-Oriented Modeling Framework Using UML

The main purpose of developing plant lifecycle model is to understand and analyze the different aetivities within the plant lifecycle and also to develop the different systems to automate the different funetions within the plant lifecycle. As the plant lifecycle is complex so it is essential to have a simple approaeh to develop such complex model. Our proposal in this book is to use the simple 00 modeling coneept to construct the plant lifeeycle models. By representing the plant model in UML-based repository will enable converting P ID into active plant object-oriented model, which is informative about all attributes and specifications of each model element i.e. pump, reactor, etc. 

A process plant has a static dimension that can be represented as structure and topology (Pohjola et al., 1997). The structure expresses the decomposition of a plant unit. The topology reflects the connectivity between units within the same level of abstraction. The plant can be divided into control group units (CGUs). The concept of CGU is described by Naka (1999). 

The operation of each equipment will be represented as an associated method with the class that represents this equipment. This will enable the operational models to be associated with the static model of the plant. This means that the P ID can be represented along with the operational models of the different equipments, which supports the concept of operational design approach (Naka, 1995). This can be useful for the 

The behavior of the plant process can be represented as states and transition among the different states. Also messages and collaboration among the different classes/objects can represent behavioral aspects of the plant. Equations controlling the transition from one state to another can be represented using object constraint language (OCL) as an associated code with the different classes and states. 

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Figure 3-2 Plant Object-Oriented Modeling Framework Using UML...

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