Identification of classes, attributes and links
Classes, attributes and links between objects are identified by identifiers.
Note
Names of objects and attributes in the XML file are not used for identification - they are only used to make the XML file easier to read. PN Driver only uses the identifiers (numbers).
Classes: ClassRID (Class Runtime Identifier)
The ClassRID identifies a class.
Attributes: AID (Attribute Identifier)
The AID identifies an attribute of an object. The attribute of an object can be a variable or a key; see section XML elements.
Links: AID (Attribute Identifier)
Objects can be connected to other objects by links. The links are identified by an AID identifier. Currently, PN Driver uses only one type of link -- it connects the IO controller object to the corresponding distributed IO system object. For details on links, see section Relationship between IO controller and distributedIOsystem.
ClassRID numbers, AID numbers and the AID number for links are listed in section PNIO classes, attributes and links.