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After a presentation of the part of the automation and the supervision in the upgrading of the process systems, we present the issues involved in the application of a Functional Analysis (FA) technique on a supervisory system of a weighing system in a grain silo. Our contribution consists on applying a FA technique SADT (Structured Analysis Design Technique). This technique allows a functional description of the weighing system of a grain silo. The paper briefly discusses the functionality of the weighing system of a grain silo and some advantages of the application of the FA for the design of a supervisory system. Then the basic principles of the application of the supervision of the weighing system are presented. Finally, the different results obtained from the application of supervision are discussed.

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