3.4.4 Structures

OPC 10000-3 differentiates between different kinds of Structures. The following conventions explain how these Structures shall be defined.

The first kind is Structures without optional fields, where none of the fields allow subtypes (except fields with abstract DataTypes). This is defined in Table 12.

The second kind is Structures with optional fields, where none of the fields allow subtypes (except fields with abstract DataTypes). This is defined in Table 13.

Structures with fields that are optional have an “Optional” column. Fields that are optional have “True” set, otherwise “False”.

The third kind is Structures without optional fields, where one or more of the fields allow subtypes. This is defined in Table 14.

Structures with fields that allow subtypes have an “Allow Subtypes” column. Fields that allow subtypes have “True” set, otherwise “False”. Fields with abstract DataTypes can always have subtypes.