Almost in all of engineering projects, especially, process control problems, the first step is dedicated to modeling and analysis. This research concentrates on distributed real-time control systems which commonly used in today's industrial automation. Function block concept and Industrial Control Standards are the most known solutions for consistency of modeling in the entire world. Function block model is based on industrial control standard and therefore is well-known and easy to use for control engineers. In addition, it has good features dealing with details of control system. In spite of wide use of function block model, it has some shortages such as complexity, lack of facility for modeling time, displaying distribution in a hard-to-understand manner, special programming language, and limitation in number of specialists. Another method for modeling introduced in this research is based on object model which is a famous and commonly used methodology in software engineering. This method can be used as an alternative for previous function block model. Object model tries to overcome the limitations of function block model. Although object-oriented approach is complete, but is not well-known among control engineers and of course, is not completely consistence with industrial control standards. Considering cons and pros for function block and object model, a new methodology is proposed in this thesis which is a combination of these two methods, named OO+FB. This method tries to eliminate shortages of two basic models, and use the advantages of each one. In addition, characteristics and advantages of new method are described in detail.