IODD data types UIntergerT / IntergerT will be mapped to OPC UA data types like described in table 84. IODD data type FloatT will be mapped to OPC UA data type Float.
In an IODD file some specific value range can be declared for variables with a list of one or several “SingleValue”-elements and/or with “ValueRange”-elements.

• SingleValue represents exactly one value
• ValueRange represents a value range
  In OPC UA the value range will be mapped with following properties:
• SingleValue => EnumValues Property of MultiStateValueDiscreteType
• ValueRange => InstrumentRange Property of AnalogItemType
  Data types of the OPC UA Properties
  Property Datentyp OPC UA DataType
  InstrumentRange Range Low: double
  High: double
  EnumValues EnumValueType Int64

Problem:
OPC UA data type EnumValueType do not cover all possible IODD Single Values

• IODD Data type FloatT
• IODD Data type UInteger with bitlength 64

Proposal:
In IOLink Nodeset, create an own OPC UA data type like “IODD EnumValueType” based on “EnumValueType” with data type “double”

See attached screenshot and https://reference.opcfoundation.org/v104/Core/docs/Part8/5.3.2/