OPC Library Import Rules

For each combination of data type and direction, the import rules define the object model to be used during the import. By reading the library import rule specified in the configuration file, the point to create is automatically determined.

The name of the data point element to associate with an OPC item is taken from the default property of a specific object model. You can view and modify the default property using the Models & Functions application. The default property must be carefully chosen and its data type must be set to GMS*** to allow the update of the Value attributes with the data contained in the CSV configuration file. It is also possible to specify a different object model by defining its name and the name of the corresponding data point element to associate ([Object Model Property] field in the CSV configuration file).

When you are in Engineering mode and select the OPC import rules in System Browser, the Import Rules tab lets you specify the rules for mapping the OPC types with the associated OPC object models.

The customization of an OPC library will affect the algorithm used to determine the object model and data element to associate with an OPC item during the import. This means that the order in which any customized library or block will be considered is determined by the standard library customization behavior (the most specific library defined for the that project).