Design considerations

Element scope

. The boundary where an element and its content can be accessed.  Every element in

FactoryTalk Design Studio

defines a scope.

Element references

. When one element refers to another element. References must be valid. For example:

An instruction references a tag as an argument to a parameter.
A tag references a data type to declare the type of the tag.
A tag references a program to be scheduled within that task.

Format of element references

. There are multiple formats that can reference an element:

Fully qualified name that explicitly names the referenced element
Partially qualified name that identifies matching qualified names in the referenced element
Element name
Owner scope operators