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• OPC-40250-1 – OPC UA for Compressed Air Systems - Part 1: Main Control Systems
  3.2.16 Unavailable [Compressor]
  Unavailable [Compressor] A compressor is Unavailable if it cannot be Integrated and controlled by the Main Control System . Note 1 to entry: The Main Control System cannot switch a compressor ... from Unavailable to any other state. EXAMPLE 1 A compressor in an error state may be Unavailable