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CVBpy 14.0
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CVBpy 14.0
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Represents an OPCUA variable node that contains a string value. More...
Inherits VariableNode.
Public Member Functions | |
| None | create (int namespace_index, str name, cvb.opcua.NodeID parent_node_id, str value) |
| Creates an OPCUA string variable node. More... | |
| None | set_value (self, str value) |
| Sets value of this node. More... | |
| str | value (self) |
| Returns value of this node. More... | |
 Public Member Functions inherited from VariableNode | |
| None | deregister_callback (self, cvb.EventCookie event_cookie) |
| Deregisters a callback. More... | |
| cvb.EventCookie | register_read_callback (self, Callable[[], None] callback) |
| Registers a callback for the read operations on this node. More... | |
| cvb.EventCookie | register_write_callback (self, Callable[[], None] callback) |
| Registers a callback for the write operations on this node. More... | |
| Public Member Functions inherited from BaseNode | |
| List[cvb.opcua.NodeID] | browse (self, cvb.opcua.BrowseFilter filter_options) |
| Enumerates the child nodes present in the OPCUA server. More... | |
| Union[int, float, str] | get_attribute (self, int attribute_id) |
| Gets specific information about this node. More... | |
| cvb.opcua.NodeID | node_id (self) |
| Gets the OPCUA node ID of this node. More... | |
| None | set_attribute (self, int attribute_id, Union[int, float, str] value) |
| Sets specific information about this node. More... | |
Additional Inherited Members | |
| Properties inherited from VariableNode | |
| datatype = property | |
| int: Gets the data type of this node (see cvb.opcua.DataType). | |
| Properties inherited from BaseNode | |
| access = property | |
| int: Gets access rights to this node (see cvb.opcua.Access). | |
| browse_name = property | |
| str: Gets the browse name of this node. | |
| connection_status = property | |
| int: Gets connection status of this node (see cvb.opcua.ConnectionStatus). | |
| description = property | |
| str: Gets description of this node. | |
| display_name = property | |
| str: Gets the human-readable name of this node. | |
| node_class = property | |
| int: Gets OPCUA node class of this node (see cvb.opcua.NodeClass). | |
Represents an OPCUA variable node that contains a string value.
It provides an interface for storage and manipulation of strings.
| None create | ( | int | namespace_index, |
| str | name, | ||
| cvb.opcua.NodeID | parent_node_id, | ||
| str | value | ||
| ) |
Creates an OPCUA string variable node.
You must add this node to a server before most operations are possible. The OPCUA BaseNode which is created by this method has the default type definition cvb.opcua.Namespace0NodeID.BASEVARIABLETYPE (see cvb.opcua.Namespace0NodeID). Further, the default reference type is cvb.opcua.ReferenceType.HasComponent (see cvb.opcua.ReferenceType). Callbacks can be registered once the node has been added with the cvb.opcua.Server.add_node method to the server with the cvb.opcua.VariableNode.register_write_callback method or the cvb.opcua.VariableNode.register_write_callback method.
namespace_index : int Index of the name space where the OPCUA node should belong to.
name : str String literal for the non-localized, human-readable name of the node.
parent_node_id : cvb.opcua.NodeID OPCUA node ID of the parent node.
value : str Initial value of the node.
| None set_value | ( | self, | |
| str | value | ||
| ) |
Sets value of this node.
value : str New value.
| str value | ( | self | ) |
Returns value of this node.
str The value of this node.