Adding the Device Definition creates a hierarchy of categories (Profibus Family, Manufacturer, Model, Device Revision, and modules) under Profibus Devices in the DeltaV Library. You can change the device and module parameter values and overwrite the default values specified by the manufacturer. You can also create Profibus module signals in the Library.
It is recommended that you change a module or device parameter value at the Library level rather than at the Slot level to ensure that future instances of the module or device inherit that parameter value.
If you change a device parameter value at the Library level, existing instances of that device are not changed but future instances of the device inherit the new parameter value. If you change a module parameter value or signal at the Library level, existing instances of that module are not changed but future instances of the module (Slots) inherit the new parameter value or signal even if the module is added to an existing device. If a device is associated with a particular Device Definition in the Library, the DeltaV Explorer will not allow you to delete or re-add that Device Definition. This ensures that the Device Definitions in the Library are consistent with existing devices.