Using Process and Transfer Tags versus Unit and Connection Tags

The following guidelines can help you decide when to define a tag as a process, transfer, unit, or connection tag.

• Any data point that is common to all units in a process class can be entered as a process tag.

• Any data point that is common to all connections in a transfer class can be entered as a transfer tag.

• Any data point that is not common to all units in a process class must be entered as a unit tag.

• Any data point that is not common to all connections in a transfer class must be entered as a connection tag.

• Any data point that is to be used in recipe transition logic must be entered as either a process or transfer tag.

• Any critical phase logic data point must be entered as a process or transfer tag. The critical phase logic data points are required by the AVEVA Batch Management System to control, monitor, and configure a phase based on the requirements of a recipe.

  The following table lists the critical phase logic data points.