The role class “StorageUnit” should be used defining the role based equipment hierarchy defined in IEC 62264-1:2013 at the storage unit level: The definition of an “StorageUnit” is given in IEC 62264-1: 2013, 5.3.9: “Storage zones and storage units are the lowest level of material movement equipment typically scheduled by the Level 4 and Level 3 functions for discrete, batch and continuous manufacturing processes. Storage units are typically managed at a finer level of detail than a storage zone. The physical location of a storage unit may change over time; for example, for goods in transit. Storage units may be dedicated to a given material, group of materials, or method of storage. Storage units can be further divided to address any hierarchical storage management scheme.”

The StorageUnit is formally defined in Table 100.

Table 100 - StorageUnit Definition

Attribute	Value
BrowseName	StorageUnit
IsAbstract	False
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Inherit the components of the ResourceStructure
HasProperty	Variable	ID	BaseDataType	PropertyType	Optional
HasProperty	Variable	Version	BaseDataType	PropertyType	Optional