Siemens SIMATIC ET 200AL - Page 899

OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
Function Manual, 12/2017, A5E03735815-AF
213
System data type "OPC_UA_NodeId"
For the OPC UA basic data type "OpcUa_NodeId", please refer to the following table for the
meaning of the parameters. Use OPC_UA_NodeId for the identification of a node in the OPC
UA server.
Parameter
S7 data type
Meaning
NamespaceIndex UINT Namespace index of the node in the OPC UA server.
A node can, for example, be a tag.
Identifier WSTRING[254] The designation of the node (object or tag) depends
on the identifier type:
• Numeric identifier: The node is labeled with a
number, for example "12345678".
• String identifier: The node is labeled with a name,
for example "MyTag". No distinction is made be-
tween upper and lower case.
IdentifierType UDINT Type of identifier
• 0: Numeric identifier
• 1: String identifier
• 2: GUID
• 3: Opaque
System data type "OPC_UA_QualifiedName"
See the following table for the structure of the system data type "OPC_UA_QualifiedName":
Name
S7 data type
Meaning
NamespaceIndex
UINT
The namespace index of the name.
Name
WSTRING[64]
Name of the node or tag.
UDT "Guid"
For the basic data type "Guid", create the following PLC data type. The default values used
as examples can also be set differently.