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Breaking From Equipment in General Recipes
The successful application of general recipes requires a significant break from the equipment centric S88 model of Master Recipes. The proven Modular Batch Automation concept, centered on the unit and equipment model, does not apply when equipment independent general recipes are developed. Even though a general recipe may define equipment constraints, it is not equipment centric, but instead uses materials as the primary organizational element. A general recipe defines the materials to be used, their order of addition or extraction, and the actions to be taken on the materials. This leads to a different set of rules to organize the general recipe procedural model. This paper defines the rules we have found useful for determining process stage and process operation boundaries. These rules include material and equipment constraints, but also include business level constraints associated with the identification and tracking of intermediate materials. These rules result in general recipes that can be readily transformed into process cell-specific equipment recipes for a variety of equipment layouts.
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