Annex B (normative) Edge Cases for Component and Airnet Handling ToC Previous Next

Adding or Removing a Component to/from a Compressed Air System During the lifetime of a Compressed Air System, the manufacturer, integrator, or operator may wish to replace, add, or remove Components to or from the system. The OPC UA provided Services AddNodes and DeleteNodes can add or remove Nodes from the AddressSpace during runtime of the OPC UA Server and are described in OPC 10000-4. If the manufacturer of a Compressed Air System wants to enable an integrator or operator to add or remove Components while the OPC UA Server is running, at least those two Services shall be available to both the Server and the Client. To additionally support the edge case B.2, the whole NodeManagement Service Set, defined in OPC 10000-4 shall be supported by both the Client and Server.

If the used Server or Client does not support the Services AddNodes and RemoveNodes, the modelled Compressed Air System shall be changed while the OPC UA Server is not running. The OPC UA Server shall only boot up after the required mechanical work is done.

Adding or Removing a Component to/from an Airnet During the life of a Compressed Air System the manufacturer, integrator, or operator may wish to add or remove Components to or from one of the Airnets. This also includes moving a Component permanently from one Airnet to another. The OPC UA provided Services AddReferences and DeleteReferences can add or remove References from Nodes in the AddressSpace during runtime of the OPC UA Server and are described in OPC 10000-4. If the manufacturer of a Compressed Air System wants to enable an integrator or operator to add or remove Components to or from one of the Airnets, or to move Components from one Airnet to another, while the OPC UA Server is running, at least those two Services shall be available to both the Server and the Client. To additionally support the edge case B.1, the whole NodeManagement Service Set, defined in OPC 10000-4 shall be supported by both the Client and Server.

If the used Server or Client does not support the Services AddReferences and DeleteReferences, the modelled Compressed Air System shall be changed while the OPC UA Server is not running. The OPC UA Server shall only boot up after the required mechanical work is done.

Temporarily Switch a Component from one Airnet to Another Some Main Control Systems allow for Components to switch from one Airnet to another by operating a valve or a similar action. If the setup of a Compressed Air System allows for such a temporarily switch, the switchable Components shall have the ActiveAirnet Property and all possible Airnets shall have an Organizes Reference to these Components. If the operation of a valve or a similar action switches one of these Components from one Airnet to another, the ActiveAirnet Property changes its Value Attribute to indicate which Airnet is currently using the Component.


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