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A Construction of Plant Supervisory Systems Using the Automatic Generation of Supervisory Pictures from Equipment Management Diagrams Hideo Nakata, Member, Taizo Kojima, Non-member, Akira Sugimoto, Non-member (Mitsubishi Electric Corporation) The construction of supervisory systems of large-scale plants requires various equipment data to be input for showing plant states, analysis, and simulation. Of these kinds of data, using graphical expression rather than textual expression makes it easy to understand connection data between pieces of equipment. Therefore, in many cases, equipmentt data are entered and manipulated with diagrams, which are called equipment management diagrams in this paper. On the other hand, various supervisory pictures, which show the behavior of monitored equipment, are also necessary for supervisory systems. These supervisory pictures are based on the above equipment management diagrams. However, the equipment management diagrams can't be used for supervisory pictures directly. After supervisory pictures are made by copying part of the equipment management diagrams, many modification and editing tasks are indispensable. This paper describes the methods for making supervisory pictures from the equipment management di agram. Acts of modification and editing tasks are defined as conversion rules and applied repeatedly. Our methods have the following advantages. [1] By dividing equipment management diagrams automatically, the equipment groups, which are converted by a conversion rule, are determined. The conversion rules can be de fined without redundancy and omission. [2] By designating the modification of connections between equipment as conversion rules, equipment symbols can be placed automatically by the conversion. The conversion rules about the location of equipment can be defined by a simple mouse operation.