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Symbol: _cds_icon_cloud

The “OPC UA Information Model” object is added to the “Communication Manager” in the application. When added, an OPC UA publishing object _cds_icon_cloud and below that an information model object _cds_icon_information_model as a child object are also added.

In the “Add OPC UA Information Model” dialog, specify a name for the information model and select the OPC UA information model. The selection includes the OPC UA information models which are installed in the “OPC UA Information Model Repository”.

OPC UA information model editor

Symbol: _cds_icon_information_model

The editor is used to select the object types and data types of the OPC UA information model which you want to use in the open CODESYS project. The selected OPC UA types are converted to IEC types in the editor.

“Browse Information Model ”

List box

The currently used information model and the information models which are referenced by the current model are displayed. The dependencies depend on the respective information model. The OPC UA base model is always displayed.

“Generate IEC declarations ”

Generates an IEC declaration for all OPC UA types converted into an IEC type. The generated IEC types are saved in a folder (example: “OPC Objects”) in the “Devices” view and can be used in the implementation of the IEC code. When implementing the CODESYS project, you can select them in the “Input Assistant” dialog.

When the IEC declarations are generated, the appropriate attributes are automatically added to the generated POUs (example: ‎'opcua.mapping.type'‎,‎'opcua.mapping.member.accesslevel'‎).

Note: The attributes added by the system should not be changed by the user.

When the IEC type cannot be created, the entry ‎UNKNOWN_TYPE‎ is displayed in the declaration instead of the data type. The user should delete this variable because in this case it is almost always an OPC UA feature which is not supported yet. OPC UA features which are not supported yet are grayed out in the left area.

“Data Model”

Left area: OPC UA data model

“Types”

Display of the OPC UA data types and object types in a tree structure

When you drag an OPC UA type to the right area, CODESYS converts the OPC UA type into the corresponding IEC type which can be used in the implementation of the CODESYS project. In this case, only the root node of an OPC UA type can be dragged to the right area.

For a detailed description of the assignment of individual OPC UA types to the corresponding IEC types in the mapping operation, see the chapters "Mapping of OPC UA Types to IEC Types" and "Mapping of Reference Types".

“Element Type”

OPC UA element type

“Reference Type”

OPC UA reference types

Example: ‎HasComponent‎, ‎HasProperty‎

For a description of these reference types, see the chapter "Mapping of OPC UA Types to IEC Types".

“Modelling Rule”

  • “Mandatory”: For the corresponding OPC UA type, the respective members are generated in the project when the “Generate IEC declarations” command is executed. In the right area, the “Generate member” field is activated and cannot be deactivated.

  • “Optional”: Generating an IEC member for this OPC UA type is optional.

  • “Optional placeholder”: in the right, you can drag another IEC type for this placeholder. For an example as a screenshot, see the chapter "Using OPC UA Companion Information Models".

Right area: Object types and data types of the OPC UA information model which are mapped to IEC types

“Name”

Name of the IEC POU or data type in the project

By default, the name of the type is displayed in the OPC UA information model. OPC UA also supports names which are invalid in IEC. In these cases, CODESYS automatically generates a valid IEC name.

You can change the name.

“IEC Type”

IEC type to which the OPC UA type was mapped (example: ‎BOOL‎, “Method”).

“OPC UA Type”

Corresponds to the “Element Type” displayed in the left area

“Generate member”

  • _cds_icon_option_activated: When the “Generate IEC declarations” command is executed, a corresponding member or a placeholder is generated in the project. Only the interfaces are automatically generated here. The implementation still has to be manually created later in a POU.

    When the “Modelling Rule” is “Mandatory” for the OPC UA type in the right area, this option cannot be deactivated.

  • _cds_icon_option_deactivated: When the “Generate IEC declarations” command is executed, a corresponding member is not generated in the project. Click this option to activate it.

OPC UA publishing editor

Symbol: _cds_icon_cloud

In the editor, the instances (OPC UA objects) of the OPC UA types are configured which should be available to the OPC UA Clients via the controller

“Search for Mapped Instances”

Searches in GVLs and PRGs below the current application for instances of the mapped OPC UA types which have already been declared. The search result is displayed in the list.

Note: Instances in the “POUs” view and in libraries are not taken into consideration.

“Create New Instance”

Opens the “Create New Instance” dialog to select the IEC type for which a new instance should be generated.

Instances can be generated for the POUs which have been created in the OPC UA information model editor from OPC UA types. These instances can be used in POUs in the application.

Requirement: In the OPC UA information model editor, the “Generate IEC declarations” command has been executed after mapping the OPC UA types to the IEC types.

“Root Node”

Selection of directories or the object instance of the server which is displayed on the OPC UA Client for publishing the instances. The list box depends on the applied OPC UA companion specification.

Tabular list of generated instances:

“OPC UA Variable”

Variable which has been generated as an instance of an OPC UA type. This variable can be published in an OPC UA Client.

You can edit the displayed name.

“OPC UA Type”

OPC UA type of the “OPC UA Variable”

“Map or Generate”

  • _cds_icon_map_to_existing_variable: The “OPC UA Variable” has been mapped to an existing variable.

  • _cds_icon_create_new_variable: The “OPC UA Variable” has been generated as a new instance.

“IEC Variable”

Full variable name

“IEC Type”

IEC type of the IEC variable

“Access Rights”

Note that an OPC UA Client may have read/write access the OPC UA variable.

In the function blocks, the access rights to the variables can be changed by attributes which can also be read from the XML file if necessary.

Reading and writing

“Maximal”

Maximum possible permissions for the OPC UA variable

See also