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Name | Meaning | Unit | Default value | ||||||
---|---|---|---|---|---|---|---|---|---|
ID | The identifier in text format, which is, in dependence on ID type, converted to the required native type. | String | |||||||
ID type | Enumerated types of identifiers. They help to access the objects in OPC UA address space. Numeric-1B ID: Identifier limited to 1-byte value (0-255) Numeric-2B ID: Identifier limited to 2-byte value (0-65535) Numeric-4B ID: 4-byte identifier String: Text identifier Guid -16B ID: 16-byte (128-bit) number that is usually divided into four parts. For example 3F2504E0-4F89-11D3-9A0C-0305E82C3301. ByteString: Identifier that is represented as a sequence of bytes. | Numeric-1B ID / Numeric-2B ID/ Numeric-4B ID/String/Guid -16B ID/ByteString | Undefined | ||||||
Namespace
| Numerical identifier of namespace of OPC UA server. Each OPC UA server can have N namespaces. However, the object identifier must be unique in one namespace. | Numeric | |||||||
Variable type | The value type of objects that can be processed by OPC UA client. Variable type should be used only if I/O tag is intended for writing. As regards the reading of the object value, the information about type is sent together with the value. | Undefined / Boolean / Byte / SByte / Integer16 / Unsigned16 / Integer32 / Unsigned32 / Integer64 / Unsigned64 / Float / Double / String / UTC Time / Boolean array / Byte array / SByte array / Integer16 array / Unsigned16 array / Integer32 array / Unsigned32 array / Integer64 array / Unsigned64 array / Float array / Double array / String array / UTC Time array / LocalizedText / LocalizedText array | Undefined | ||||||
Array index | If the object value is represented as a value array (Boolean array / Byte array / SByte array / Integer16 array / Unsigned16 array / Integer32 array / Unsigned32 array / Integer64 array / Unsigned64 array / Float array / Double array / String array / UTC Time array), the parameter defines its range or value of a particular item. The first element of array is identified by index 0. A text representation of array index may be in several formats:
| String | |||||||
Write only | It controls if the I/O tag is a part of subscription. Its value will be sent periodically from the server in "Publish message". | Unchecked/checked | Unchecked | ||||||
Expanded Node ID | If it is checked, it enables to address the ExpandedNodeId. Unlike the classic identifier in the OPC UA address space, ExpandedNodeId is supplemented by NameSpace URI and Server index. | Unchecked/checked | Unchecked | ||||||
NamespaceUri | Text identifier of the namespace of the OPC UA server that is used instead of the numerical representation of a namespace. | String | |||||||
ServerIndex | A numerical identifier that addresses the server number when using the ExpandedNodeID identifier. | Numeric | 0 |
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This dialog window is intended for browsing and inserting the OPC UA objects into the address parameter of the I/O tag. The upper part contains the tree structure of the address space. When clicking on the object, the lower part of the window displays the direct descendants of the object (variables, tags).
Double click on one of the descendants transfers the address parameters of an object to the address dialog window of the I/O tag.
Note: Using Ctrl+C it is possible to copy a list of displayed descentants into Windows clipboard. All descendants will be copied unless a specific descendant is selected.
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