Practical usage of OPC UA information models

A short presentation about how the OPC UA information models are used from the viewpoint of a developer. I presented this at OPC and MES Day 2013 (organized by Finnish Society of Automation).

Transcript

1. Practical usage of OPC UA information models Eero Laukkanen
2. Why to model?
3. Interoperability with common information models
4. Information organization with types and relations
5. How to model? (server-side example)
6. Address space Types Objects
7. 1. Create types Types Objects
8. Model
9. UaModeler
10. <UAObjectType NodeId="ns=1;i=1001" BrowseName="1:ValveType"> <DisplayName>ValveType</DisplayName> <References> <Reference ReferenceType="HasProperty">ns=1;i=6012</Reference> <Reference ReferenceType="HasComponent">ns=1;i=6010</Reference> <Reference ReferenceType="HasComponent">ns=1;i=6011</Reference> <Reference ReferenceType="HasSubtype" IsForward="false">i=58</Reference> </References> </UAObjectType> <UAVariable DataType="Date" ParentNodeId="ns=1;i=1001" NodeId="ns=1;i=6012" Browse <DisplayName>BestBefore</DisplayName> <References> <Reference ReferenceType="HasModellingRule">i=78</Reference> <Reference ReferenceType="HasTypeDefinition">i=68</Reference> <Reference ReferenceType="HasProperty" IsForward="false">ns=1;i=1001</Refe </References> </UAVariable> <UAVariable DataType="Double" ParentNodeId="ns=1;i=1001" NodeId="ns=1;i=6010" Brow XML
11. Types Types
12. Model XML Types <UAObjectType NodeId="ns=1;i=1001" BrowseName="1:ValveType"> <DisplayName>ValveType</DisplayName> <References> <Reference ReferenceType="HasProperty">ns=1;i=6012</Reference> <Reference ReferenceType="HasComponent">ns=1;i=6010</Reference> <Reference ReferenceType="HasComponent">ns=1;i=6011</Reference> <Reference ReferenceType="HasSubtype" IsForward="false">i=58</Reference> </References> </UAObjectType> <UAVariable DataType="Date" ParentNodeId="ns=1;i=1001" NodeId="ns=1;i=6012" BrowseName="1:BestBefore" UserAccessLevel="3" AccessLevel="3"> <DisplayName>BestBefore</DisplayName> <References> <Reference ReferenceType="HasModellingRule">i=78</Reference> <Reference ReferenceType="HasTypeDefinition">i=68</Reference> <Reference ReferenceType="HasProperty" IsForward="false">ns=1;i=1001</Reference> </References> </UAVariable> <UAVariable DataType="Double" ParentNodeId="ns=1;i=1001" NodeId="ns=1;i=6010" BrowseName="1:Flow" UserAccessLevel="3" AccessLevel="3"> <DisplayName>Flow</DisplayName> <References> <Reference ReferenceType="HasTypeDefinition">i=63</Reference> <Reference ReferenceType="HasModellingRule">i=78</Reference> <Reference ReferenceType="HasComponent" IsForward="false">ns=1;i=1001</Reference> </References> </UAVariable> <UAVariable DataType="Boolean" ParentNodeId="ns=1;i=1001" NodeId="ns=1;i=6011" BrowseName="1:IsOpen" UserAccessLevel="3" AccessLevel="3"> <DisplayName>IsOpen</DisplayName> <References> <Reference ReferenceType="HasTypeDefinition">i=63</Reference> <Reference ReferenceType="HasModellingRule">i=78</Reference> <Reference ReferenceType="HasComponent" IsForward="false">ns=1;i=1001</Reference> </References> </UAVariable> MANUAL
13. 2. Create objects Types Objects
15. Java classes Application code Objects Model XML Types MANUAL MANUAL MANUAL
16. Problems? 
17. Manual work 
18. Error-prone 
19. Solution? 
20. Create objects from the types 
22. XML Application code Objects Model XML Types MANUAL MANUAL
23. Generate Java classes 
24. // using "pure" nodes UaNode valve = …; double flow = (Double) valve.getComponent("Flow").getValue(); boolean isOpen = (Boolean) valve.getComponent("IsOpen").getValue(); DateTime bestBefore = (DateTime) valve.getProperty("BestBefore").getValue(); // using generated Java class ValveType valve = …; double flow = valve.getFlowValue(); Boolean isOpen = valve.getIsOpenValue(); DateTime bestBefore = valve.getBestBefore();
25. XML Application code Objects Model XML Types XML Java classes Application code  MANUAL MANUAL
26. Ready yet?
27. Code generator
28. XML Templates Generator Java classes
29. public class {{name}} { {{#fields}} {{type}} {{name}}; {{/fields}} }
30. public class ValveType { double flow; boolean isOpen; DateTime bestBefore; }
31. Creating objects
32. // create valve object NodeManagerUaNode manager = …; NodeId valveTypeId = …; ValveType valve = manager.createNodeWithTypeAndName(valveTypeId, "Valve1"); // add object to the address space UaObject objects = manager.getNode(Identifiers.ObjectsFolder); objects.addComponent(valve); // use the object valve.setFlowValue(0.674); valve.setIsOpenValue(true); DateTime bestBefore = DateTime.parseDateTime("2024-11-16"); valve.setBestBeforeValue(bestBefore);
34. Questions? eero@prosysopc.com prosysopc.com