repository·master·Indexed 42 days ago
https://github.com/mikakaraila/node-red-contrib-opcuaA Node-RED node for communicating with or serving as an OPC UA server, based on the node-opcua library. Version 0.2.355 provides OpcUa-Item for defining variables and OpcUa-Client for reading, writing, subscribing, and browsing OPC UA servers.
The package provides two primary ways to interact with OPC UA:
To use these nodes in Node-RED, install them via npm. You can install them locally in your Node-RED installation directory or globally.
# Local installation in Node-RED directory
npm install node-red-contrib-opcua
# Global installation
npm install -g node-red-contrib-opcuaWhen working with array types (e.g., datatype=Int32Array), you can read or write specific segments of the array using an index range.
msg.payload.range to a string representing the index range (e.g., "2:4").msg.range to the index range string.To control the OpcUa-Client node, pass a message with specific properties. The msg.topic defines the target NodeId and DataType in the format ns=3;s=Counter;datatype=Int32. The msg.action determines the operation to perform.
### Input Message Properties
| Property | Function/Value | Notes |
| :--- | :--- | :--- |
| payload | set interval for subscription or monitorItem | |
| interval | Subscription interval | |
| queueSize | Subscription queue size | |
| deadbandType | "a" abs. or "p" percent | Action monitor |
| deadbandValue | integer for deadband | Action monitor |
| topic | NodeId and DataType in format `ns=3;s=Counter;datatype=Int32` | |
| action | subscribe | nodeId / variable |
| | unsubscribe | nodeId / variable |
| | deletesubscription | subscription |
| | browse | nodeId / folder |
| | info | nodeId |
| | read | nodeId |
| | write | nodeId & value |
| | monitor | deadbandtype abs/pro |
| | events | nodeId |
| | readmultiple | [nodeId + datatype] |
| | writemultiple | [nodeId + datatype + value] |
| | clearitems | empty multiple items (readmultiple / writemultiple) |When an OpcUa-Client node completes an operation, it emits a message with the following structure:
### Output Message Properties
| Property | Function/Value | Notes |
| :--- | :--- | :--- |
| payload | dataValue.value.value | |
| statusCode | OPC UA StatusCode | |
| sourceTimestamp | Source timestamp | |
| serverTimestamp | Server's timestamp | |