How do you use OPC UA Modeler?

Online · SaaS

In your browser

Nothing to install. Edit with live validation and diagrams, generate with the AI assistant, share with your team.

Open the online editor ↗Sign in or create an account

On premise

On your own machines

Command-line compiler, VS Code extension and MCP server for AI agents. Your models stay on your network and build in your own git repository and CI.

Get started locally →Installs with npm

Same in both: the model format

A .model.yaml file compiles the same way online and on premise, so a model can move from one to the other at any time.

OPC UA conceptsThe OPC UA you need to read a model.YAML model formatTypes, instances, data types, methods, state machines.SpecificationThe complete definition of the YAML format.ExamplesAnnotated models, from a sensor to OPC UA FX.NodeSet2.xml to YAMLStart from an existing NodeSet2.xml.DiagnosticsEvery error and warning code, with fixes.REST APICompile and validate from your own tools.FAQ and release notesCommon questions, and what changed.

What a model looks like

This YAML compiles to the NodeSet2.xml on the right. NodeIds, aliases and namespace indexes are assigned for you. Read a full example →

TemperatureSensor.model.yaml

namespaceUri: http://sterfive.com/UA/TemperatureSensor
version: 1.0.0
namespaces:
  - di
objectTypes:
  - browseName: TemperatureSensorType
    subtypeOf: di:DeviceType
    components:
      - browseName: di:ParameterSet
        components:
          - browseName: Temperature
            dataType: ua:Double
          - browseName: SetPoint
            dataType: ua:Double
            accessLevel: CurrentRead | CurrentWrite

TemperatureSensor.NodeSet2.xml (excerpt)

<UAObjectType NodeId="ns=1;i=1000"
    BrowseName="1:TemperatureSensorType">
  <DisplayName>TemperatureSensorType</DisplayName>
  <References>
    <Reference ReferenceType="HasComponent">ns=1;i=1001</Reference>
    <Reference ReferenceType="HasSubtype"
        IsForward="false">ns=2;i=1002</Reference>
  </References>
</UAObjectType>
<UAObject NodeId="ns=1;i=1001" BrowseName="2:ParameterSet"
    ParentNodeId="ns=1;i=1000">…</UAObject>
<UAVariable NodeId="ns=1;i=1002" BrowseName="1:Temperature"
    ParentNodeId="ns=1;i=1001" DataType="Double">…</UAVariable>
<UAVariable NodeId="ns=1;i=1003" BrowseName="1:SetPoint"
    ParentNodeId="ns=1;i=1001" DataType="Double">…</UAVariable>