The SlotType represents a physical slot to which a module can be attached, e.g., in a modular Asset like a PLC backplane or modular IO device.

The SlotType is formally defined in Table 37.

Table 37 – SlotType definition

Attribute	Value
BrowseName	3:SlotType
IsAbstract	False
References	Node Class	BrowseName	DataType	TypeDefinition	Other
Subtype of the 3:AssetConnectorType
0:HasProperty	Variable	3:Id	0:UInt16	0:PropertyType	M
0:HasProperty	Variable	3:LogicalId	0:UInt16	0:PropertyType	O
ConformanceUnits
UAFX AssetConnector Slot Base

Id is from AssetConnectorType and is mandatory in SlotType. It shall start at 1 and increment by 1 for each physical slot in a rack or device.

The optional LogicalId represents the“logical slot number” that might be assigned to a physical ID. For example, module 3 is physically plugged into slot 3, but internally it is used as slot 8.

Each Slot that has a module plugged into it shall have a HasPhysicalComponent Reference (see OPC 10000-23) or a subtype of it, or an IsPhysicallyConnectedTo Reference or a subtype of it, indicating the Asset that occupies the Slot.