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All declarations are declared altogether as local variables between ‎VAR‎ and ‎END_VAR‎. The user can change the declarations as needed in ‎VAR_INPUT‎ and ‎VAR_OUTPUT‎.

Table 481: Object types

OPC UA

IEC

Description

OPC UA object types

Function blocks

Interfaces and add-ins

Function block

The members of the interface are members of the function block.

Example:

_cds_img_opc_ua_map_interfaces.png

Inheritance

Instead of generating multiple function blocks with "Extends", a flat hierarchy is generated.

Example:

_cds_img_opc_ua_map_object_inheritance.png

Folder

A separate type for each instance of a folder in an OPC UA object type

The user may add the instances on his own by editing the declaration of the IEC POUs. However, function blocks have to be used which originate from an OPC UA companion.

All instances of function blocks below the folder are exported. Semantic checks based on NodeSet2.xml are not possible.

Initially, a folder is set as an object type in OPC UA. However, it is not enough to generate a ‎FolderType‎.

_cds_img_opc_ua_map_folder.png

The user is responsible for adding appropriate elements to the folder.

‎BaseObjectType‎ a as folder

See description

(as for folder)

OPC UA defines an individual data type for folders: the ‎FolderType‎ (see above: Folder). However, there is also the possibility to declare only ‎BaseObjectType‎ in an instance instead of this type and then use this type like a folder. From the OPC UA side, there are no restrictions regarding what is allowed as child elements. The mapping to IEC in this case looks the same as for a ‎FolderType‎.