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Foundation Fieldbus is for sure a powerful and complete protocol. Its characteristics add and change features on process control. One important issue in Fieldbus is reliability. A lot of discussions have been raised about this issue, but not considering all technical specifications. With this paper we will clarify the Foundation Fieldbus reliability concept, proving that the technical specifications of Foundation Fieldbus make this protocol as reliable as any other process control technology in use today. Foundation Fieldbus has several features embedded on the protocol that guarantee reliability. Redundancy is only a part of it. Several other features make Foundation Fieldbus reliable without requiring a complex and expensive redundant solution. Subjects like redundancy, status, fail safe control will be discussed under the light of reliability. Then these concepts will be used to make comparisons between Fieldbus and known traditional control systems.
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