Product specifications

Accessing 800xA via OLE DB
474 3BDS011222-510 B
Short References. You use a graphical user interface to predefine short references
to Historical logs (OPC HDA) or object properties (OPC DA). These short
references are objects of the OLE DB Access Table for DS or the OLE DB Access
Table for History object types. The aspects contain all the information needed for a
specific OPCHDA or OPCDA call to get the requested data. You can use the short
references in two ways, from the command line or through the reporting packages.
The names of the short reference are the “OBJECTHELPER” name mentioned
above in Table 25. You can view these aspects in the Library Structure in Plant
Explorer.
Graphical User Interface History
To create a short reference you have to create an object in the Library Structure.
The name of the object is the name of the short reference you are making. The
object can be of the OLE DB Access Table for DS or the OLE DB Access Table for
History object type. When you open the matching aspect, you will see the graphical
interface shown below in Figure 288
Figure 288. Graphical User Interface for the Help Aspect in History & Trend
Access