WS DataPoints are clearly distinguished from vendor- or project-specific data points by their prefixes in the WS BrowseName. For example, all WS DataPoints have the prefix “WS_”. This differentiation option is to be supplemented in OPC UA by the introduction of namespaces. For this purpose, all BrowseNames of WS DataPoints will be located in the namespace http://weihenstephan-standards.com/WS/. An example for the BrowseName of a WS DataPoint is “5:WS_Tot_Packages”. Vendor-specific data points will get their own namespace following the pattern of the WS namespace.
At this point it should be noted that a WS datapoint is usually associated with three namespaces. Table 14 shows the dependency to the required namespaces for the WS datapoint WS_Tot_Packages.
Table 14 – Dependencies to the required namespaces using the example of the WS DataPoint WS_Tot_Packages
|
Node property |
Example |
NamespaceURI |
|
NodeId |
ns=6;i=5003 |
|
|
BrowseName |
5:WS_Tot_Packages |
|
|
HasTypeDefinition |
1:WSAnalogUnitType |