Synopsis#

Methods#

def __init__()
def attribute()
def indexRange()
def nodeId()
def __ne__()
def setAttribute()
def setIndexRange()
def setNodeId()

Note

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Detailed Description#

A read operation on an OPC UA server returns the entire value or a certain index range of the value of an attribute of a node on the server. This class contains the necessary information for the backend to make a read request to the server.

One or multiple objects of this class make up the request of a readNodeAttributes() operation.

See also

readNodeAttributes() QOpcUaReadResult

__init__()#

Default constructs a read item with no parameters set.

__init__(other)

Parameters:: other – QOpcUaReadItem

Constructs a read item from other.

__init__(nodeId[, attr=QOpcUa.NodeAttribute.Value[, indexRange=""]])

Parameters:

nodeId – str
attr – NodeAttribute
indexRange – str

Constructs a read item for the index range indexRange of the attribute attr of node nodeId.

attribute()#

Return type:: NodeAttribute

Returns the node attribute id.

See also

setAttribute()

indexRange()#

Return type:: str

Returns the index range.

See also

setIndexRange()

nodeId()#

Return type:: str

Returns the node id.

See also

setNodeId()

__ne__(rhs)#

Parameters:: rhs – QOpcUaReadItem
Return type:: bool

Returns true if lhs is not equal to rhs; otherwise returns false.

Two read items are considered not equal if their nodeId, attribute or indexRange are not equal.

setAttribute(attribute)#

Parameters:: attribute – NodeAttribute

Sets the node attribute id to attribute.

See also

attribute()

setIndexRange(indexRange)#

Parameters:: indexRange – str

Sets the index range to indexRange.

See also

indexRange()

setNodeId(nodeId)#

Parameters:: nodeId – str

Sets the node id to nodeId.

See also

nodeId()