Project Node IDs

When you save a project, the IDs of the project nodes that are not exposed through OPC UA may change to optimize performance. If the OPC UA server exposes nodes, the IDs of these nodes become fixed. They do not change when you save the project.
NOTE: See Terms dictionary to learn more about the nodeID definition.

Custom Node IDs

You can define custom fixed Node IDs by editing the
ProjectName
\Nodes\Model\Model.yaml
 file.
IMPORTANT:
Rockwell Automation
 recommends editing the
Model.yaml
 file only for the most advanced users as it may lead to project corruption. Ensure to back up your project before making any changes to the
Model.yaml
file. See Duplicate a project, Project backup, and Restore a project.
The following example of the
Model.yaml
 file shows custom IDs defined for four variables: 
Name: Model
Id: g=fb6543bf8c558b11ea2f5be225a426c0
Type: FolderType
Children:
- Name: Variable1
  
Id: g=d457b2dd5183a536fd7e00ed1de83292

  Type: BaseDataVariableType
  DataType: String
  Value: "Variable with GUID"
- Name: Variable2
  
Id: "s='Custom Variable 2'"

  Type: BaseDataVariableType
  DataType: String
  Value: "Variable with String spaced ID"
- Name: Variable3
  
Id: s=CustomVariable3

  Type: BaseDataVariableType
  DataType: String
  Value: "Variable with String ID"
- Name: Variable4
  
Id: i=12345

  Type: BaseDataVariableType
  DataType: String
  Value: "Variable with Integer ID"
- Name: Variable5
  
Id: 's="some"."name"'
  
  Type: BaseDataVariableType
  DataType: Int32
  Value: 2
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