Recipe Allocation and Release

Recipe allocation takes precedence over Automatic allocation. Recipe Allocation refers to the allocation of units or connections through the inclusion of an Allocate Process Instance or Allocate Transfer Instance phase in the recipe procedure.

With Recipe allocation, equipment (unit or connection) is reserved for exclusive use by the batch in which the phase is run. The recipe Allocate Process Instance phase allocates and reserves a unit. The recipe Allocate Transfer Instance phase allocates both a destination unit and a connection, but it only reserves the connection. The destination unit is allocated by using the rules of automatic allocation. If it is required to also reserve the destination unit, then the Allocate Process Instance phase must be used in conjunction with the Allocate Transfer Instance phase in the recipe procedure. In addition, source units are never recipe-allocated when an Allocate Transfer Instance phase is run.

The same selection criteria defined for automatic allocation is true for recipe allocation with the additional requirement that recipe allocated equipment remains allocated to the batch until a corresponding recipe release phase is encountered in the recipe procedure or until the batch is complete.

Recipe allocation phases are treated the same as other phases in a recipe. Recipe processing is not proceeded until a unit or connection defined by the Allocate phase is assigned to the batch.