---
description: Reference all fixed OPC UA Standard nodes, dynamic node patterns, directions, types, and ownership rules.
alias: userguide-equipment-integration-opcua-standard-node-reference
---

# Node Reference

## NodeId Pattern

```text
<IndEqOpcUaBaseNodeId>.<RelativeNode>
```

`IndEqOpcUaBaseNodeId` is a fully qualified string NodeId in the form `ns=<Namespace>;s=<HierarchyPath>`. The tables below show the relative nodes appended to it. See [OPC UA Address Space](../modeling/opcua-address-space.md#relative-node-construction).

## Track In

| Relative node | Type | Owner | Access needed by **Connect IoT** |
| --- | --- | --- | --- |
| `Operation.TrackIn.Material.Name` | `String` | Machine | Read |
| `Operation.TrackIn.MachineOperationRequest` | `Boolean` | Machine | Read / subscribe |
| `Operation.TrackIn.MESOperationPerformed` | `Boolean` | MES / **Connect IoT** | Write |
| `Operation.TrackIn.MachineOperationConfirmed` | `Boolean` | Machine | Read / subscribe |

## Track Out

| Relative node | Type | Owner | Access needed by **Connect IoT** |
| --- | --- | --- | --- |
| `Operation.TrackOut.Material.Name` | `String` | Machine | Read |
| `Operation.TrackOut.MachineOperationRequest` | `Boolean` | Machine | Read / subscribe |
| `Operation.TrackOut.MESOperationPerformed` | `Boolean` | MES / **Connect IoT** | Write |
| `Operation.TrackOut.MachineOperationConfirmed` | `Boolean` | Machine | Read / subscribe |

## Abort

| Relative node | Type | Owner | Access needed by **Connect IoT** |
| --- | --- | --- | --- |
| `Operation.Abort.Material.Name` | `String` | Machine | Read |
| `Operation.Abort.MachineOperationRequest` | `Boolean` | Machine | Read / subscribe |
| `Operation.Abort.MESOperationPerformed` | `Boolean` | MES / **Connect IoT** | Write |
| `Operation.Abort.MachineOperationConfirmed` | `Boolean` | Machine | Read / subscribe |

## Recipe

| Relative pattern | Type | Owner | Access needed by **Connect IoT** |
| --- | --- | --- | --- |
| `Recipe.<ParameterName>` | Parameter-specific | MES / **Connect IoT** | Write |
| `Recipe.<ResourceRecipeName>.<ParameterName>` | Parameter-specific | MES / **Connect IoT** | Write |

The names are dynamic and must match MES. Placeholder names are not part of the fixed contract.

## Data Collection

| Relative node | Type | Owner | Access needed by **Connect IoT** |
| --- | --- | --- | --- |
| `DataCollection.Material.Name` | `String` | Machine | Read |
| `DataCollection.PostDataReadingNumber` | `Int32` | Machine | Read |
| `DataCollection.PostDataSampleId` | `String` | Machine | Read |
| `DataCollection.Parameters.<ParameterName>` | Parameter-specific | Machine | Read |
| `DataCollection.MachinePostDataRequest` | `Boolean` | Machine | Read / subscribe |
| `DataCollection.MESPostDataPerformed` | `Boolean` | MES / **Connect IoT** | Write |

## State

| Relative node | Type | Owner | Access needed by **Connect IoT** |
| --- | --- | --- | --- |
| `State.MainState` | `String` | Machine | Read / subscribe |
| `State.SubState` | `String` | Machine | Read / subscribe |
| `State.Reason` | `String` | Machine | Read / subscribe |

## Initial Values

At idle, initialize control nodes to:

```text
Operation.*.MachineOperationRequest   = false
Operation.*.MESOperationPerformed     = false
Operation.*.MachineOperationConfirmed = false
DataCollection.MachinePostDataRequest = false
DataCollection.MESPostDataPerformed   = false
```

Payload and state initial values are project-specific. Use values that are valid for their OPC UA type and cannot be confused with a real production request.

## Direction Summary

```mermaid
flowchart LR
    M("Machine / PLC<br/>Request, Payload, Confirmation, and State")
        <--> S("OPC UA Server")

    S -->|"Read / Subscribe"| I("Connect IoT")
    I -->|"Write Performed Signals<br/>and Recipe Values"| S

    I <--> E("Critical Manufacturing MES")

    classDef standard fill:#FFFFFF,stroke:#64748B,color:#334155,stroke-width:1.5px;
    classDef highlight fill:#075C00,stroke:#075C00,color:#FFFFFF,stroke-width:1.5px;

    class M,S,E standard;
    class I highlight;

    linkStyle default stroke:#94A3B8,stroke-width:1.5px;
```