Connectionless Model

A connectionless model approach uses a subset of the available configuration tools of the flexible AVEVA Batch Management system. This approach requires a more complete understanding of the process by the recipe builder and the operators. With some extra work in the control system logic, a connectionless model approach can also provide complete material tracking.

In a connectionless model, the physical process is defined with units only. Units are the same in any model, that is, any vessel that can hold or process materials. Unique statuses can be defined that describe the possible states that each unit can assume.

All units that have the same processing capabilities or perform the same function are grouped in the same process class. The processing capabilities of each class are defined with phases. Each phase is an independent action that requires a unique set of parameters that configure the phase based on the requirements of a recipe. A phase can be processed either automatically or manually.

The connectionless model approach does not use connections and segments. The movement of material between units is accomplished using complementary process phases. For example, to move material from a reactor to a mix tank, a discharge phase associated with the reactor and a charge phase associated with the mix tank are required. The recipe builder is responsible for coordinating these two phases as part of the recipe procedure. Coordination of unit-to-unit management is the responsibility of the operator or control system.

Proper material tracking within a connectionless transfer requires the definition of input parameters for the appropriate source class discharge phase, and the definition of output parameters for the appropriate destination class charge phase.