C# project nodes

The code of a NetLogic represents the project nodes by special C# classes that contain and expose properties.

IUANode
class

Displays the following base properties of any project node:

BrowseName: The name of the node in the project. Cannot be localized.
DisplayName: The name of the node visible in the user interface. Can be localized.
NodeId: The automatically assigned unique ID for the node.

IUAObject
class

Displays the properties of any instance of a project object (for example: a graphical object, alarm, driver).

It is an

IUANode

subclass, which displays all of its properties. It also exposes the

ObjectType

property, which is a reference to the object type (

IUAObjectType

class) from which the instance derives.

IUAObjectType
class

Displays the properties of any type of a project object (for example: a graphical object, alarm, driver).

It is an

IUANode

subclass, which displays all of its properties. It also exposes the

SuperType

property, which is the C# object that represents the object type from which the same

IUAObjectType

derives.

IUAVariable
class

Displays the properties of any project variable instance (base variable, analog variable, controller tag, node pointer).

It is an

IUANode

subclass, which displays all of its properties. It also exposes the following properties:

ArrayDimensions: The quantity of cells in the array.
DataType: The data type that the variable can contain (for example:
OpcUa.DataTypes.Boolean
,
OpcUa.DataTypes.Int16
).
Value: The value of the variable (
UAValue
property).
VariableType: The C# object that represents the type of the variable from which the instance derives.

IUAVariableType
class

Displays the properties of any type of a project variable.

It is an

IUANode

subclass, which displays all of its properties. It also exposes the following properties:

ArrayDimensions: The quantity of cells in the array.
DataType: The data type that the variable can contain (for example:
OpcUa.DataTypes.Boolean
,
OpcUa.DataTypes.Int16
).
SuperType: The C# object that represents the variable type from which the same
IUVariableType
derives.

UAValue
class

Displays a value. The value can then be converted to and from different types of C# data.

Classes for custom and default objects and variables

A corresponding C# class is available for any custom or default objects and variables. The class is always a subclass of

IUAObject

IUAVariable

, to which any properties specified in the type are added.

For example, if a

Motor

object type is created in

FactoryTalk Optix Studio

with the

Speed

and

Acceleration

properties, the

Motor

C# class is automatically created with the

Speed

SpeedVariable

Acceleration

, and

AccelerationVariable

properties.

C# default class types are defined in

FTOptix

modules. When you save the project,

FactoryTalk Optix Studio

creates C# classes that correspond to custom types.

TIP: Display the type of an object or variable selected from which an instance derives in

Properties

by hovering over the

Type

value.

Object properties

For each OPC UA Object Type, the following C# property variants are available:

A property which name equals to the BrowseName of the property: Represents the value of the property (for example:
"Current speed is: "
). The value of the property is that of the same C# property (for example, string data type for
Text
).

For example, the
Text
class for the
Text
property of a
Label
object.
A property of the IUAVariable type which name consists of the BrowseName of the property and the Variable suffix: Represents the OPC UA node of the property. It is useful for setting dynamic links and other instructions that require access to the
IUAVariable
class of the property.

For example, the
TextVariable
property corresponds to the
Text
property of a
Label
object.