12 MachineStatusType 
12.2 IsPresent
This Property informs the client if the machine is physically present and connected. May be FALSE e.g. when an aggregation server is configured to provide data for several machines.
Online versions of OPC UA specifications and information models.
This Property informs the client if the machine is physically present and connected. May be FALSE e.g. when an aggregation server is configured to provide data for several machines.