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This paper proposes Unified Modeling Language (UML) as modeling tool for distributed control systems (DCSs) according to the IEC 61499 standard. The reason behind using this model is a demand to describe the system considering the whole development process. The object-oriented (OO) concept in UML along with its supporting tools is a good candidate for this purpose. However, IEC 61499 is built on the use of interconnected function blocks (FBs) as a modeling paradigm. A mapping concept from UML into FB-based systems and its implementation are presented. As a result, the UML model using class diagrams, packages, and state diagrams can be transformed automatically to models according to IEC 61499. The proposed process leads to a combination of previously disjoint design levels in the system development.