getNodeAttributes

Read OPC UA server node attributes

Syntax

values = getNodeAttributes(uaClient,nodeList,attributeIds)

values = getNodeAttributes(nodeList,attributeIds)

Description

values = getNodeAttributes(uaClient,nodeList,attributeIds) reads from the server the attributes defined by attributeIds for the nodes identified by nodeList. You can define node objects for nodeList using getNamespace or browseNamespace functions.

values = getNodeAttributes(nodeList,attributeIds) reads from the nodes identified by nodeList. All nodes must belong to the same connected client.

Examples

Read Node Attributes

Read node attributes from the server for one layer of the namespace.

uaClient = opcua('opc.tcp://localhost:53530/OPCUA/SimulationServer');
connect(uaClient);
nodeList = getNamespace(uaClient);
values = getNodeAttributes(uaClient,nodeList,{'NodeId','Description'})

Values = 
4x1 struct array with fields:
    NodeId
    Description

Input Arguments

uaClient — OPC UA client

OPC UA client object

OPC UA client, specified as an OPC UA client object

nodeList — List of nodes

array of node objects

List of nodes, specified as an array of node objects. For information on node object functions and properties, see OPC UA Node.

attributeIds — Server attributes

uint32 array | cell array of character vectors | array of strings

Server attributes specified as an uint32 array, cell array of character vectors, or array of strings.

This table lists the attribute IDs available in the OPC UA Specification.

Identifier	Attribute	Description
1	NodeId	Node identifier, represented as a string.
2	NodeClass	Node class enumeration (integer): 1 - Object, 2 - Variable, 4 - Method.
3	BrowseName	Name used to create browse paths, represented as a string.
4	DisplayName	Name of the node.
5	Description	Description of the node.
6	WriteMask	32-bit unsigned integer describing writable elements of the node.
7	UserWriteMask	32-bit unsigned integer describing writable elements of the node considering user access level.
8	IsAbstract	True if the node is an abstract node.
9	Symmetric	True if the node reference type is symmetric.
10	InverseName	Inverse name for non-symmetric reference nodes.
11	ContainsNoLoops	True if node has no looping references in the server.
12	EventNotifier	True if client can subscribe to events on this node.
13	Value	Value of node. Only defined for Variable type nodes. Empty otherwise.
14	DataType	Server data type, represented as a string.
15	ValueRank	Server value rank.
16	ArrayDimensions	Size capability of each dimension. A value of 0 in a dimension indicates any size.
17	AccessLevel	True if the Variable node is readable and writable.
18	UserAccessLevel	True if the Variable node is readable and writable by the current user.
19	MinimumSamplingInterval	Sampling interval required by the server to reasonably sample the node Value for changes.
20	Historizing	True if the server is actively collecting data for the history of the Variable node.
21	Executable	True if the node is executable. Only defined for Method nodes. Empty otherwise.
22	UserExecutable	True if the node is executable considering user access level. Only defined for Method nodes. Empty otherwise.

Output Arguments

values — Attribute values

structure

Attribute values, returned as a structure. The structure array contains the fields given by the AttributeIds. If the function cannot read an attribute for a node, it returns the relevant field as empty.

Version History

Introduced in R2015b