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• OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access
  3.1.2 AnalogItem
  AnalogItem DataItem that represents continuously-variable physical quantities (e.g., length, temperature), in contrast to the digital representation of data in discrete items Note 1 to entry: Typical examples ... temperature sensors or pressure sensors. OPC UA defines specific VariableTypes to identify an AnalogItem . Properties describe the possible ranges of AnalogItems
• OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access
  5.4 Address Space model
  Figure 4 illustrates the basic AddressSpace model of a DataItem , in this case an AnalogItem . Figure 4 - Representation of DataItems in the AddressSpace Each DataItem is represented by a DataVariable