Product specifications

Composite Object Types Appendix A Object Types
538 3BDS011222-510 B
The object type group contains two simple object types, AI and DI, and one
composite object type Tank that has two formal instances of AI and DI.
One instance of the composite object type is also shown in Figure 333. The
Functional Structure object below Tank is a Formal Instance List object that
determines which structure the branch below it will be created in. The AI1 and DI1
objects below the Tank object are formal instances, which in reality makes the
object type a composite object type. A formal instance is an object type instance that
can be configured as any other instance. When a composite object type is
instantiated all formal instances are instantiated to real instances, which are copies
of the formal instances.
Figure 333. Composite Object Type and Instance