Process Model 

One of the components of the recipe is the process. In Recipe Management, a process is mapped with its process elements and the relationships between them. For the sake of clarity, the underlying process model is described here.

Process Model as per ISA S88

The process is the top element in the model. There is only one process in a recipe and it can be divided into several stages, which in turn, can be divided into different operations. Actions are located at the lowest level in the hierarchy and are combined to form a process operation.

The bottom process elements in the hierarchy are always dependent on the top process elements. In this model, there is a 1 to 1…N relationship between the individual levels.

The process model describes the process part of the general recipe and site recipe. Rather than referring to the equipment, the process corresponds to a procedure that is linked to it.

Extended Process Model

To make Recipe Management faster and more efficient, the model was extended. Process elements can exist as independent building blocks that are autonomous of higher process elements and can be used to create new recipes. The 1 to 1…N relationship is now no longer mandatory. Each process element can be divided into various lower process elements (this is optional). Lower-level process elements within a building block are always dependent on the building block.

The recipe and the process can reside at the same level in this model. If there is a 1 to 1 relationship between the recipe and process, the process does not explicitly appear in the recipe. This equal relationship prevents process building blocks from being copied to an existing recipe. You use the process copy of a recipe to create a new recipe, to which all the elements in the process are copied. Conversely, you can also copy a recipe to a process.

The process elements in the recipe are dependent on the recipe. You can use stages that contain operations that, in turn, contain process actions.

In this model, the potential relationships between independent objects were defined with 0..1 to 0..N and between dependent objects with 1 to 0..N between the levels.

Example