OPC UA Write and Read operations in a batch

This example pipeline demonstrates handling of different data types in OPC UA communications, covering the most common data types used in industrial automation and control systems. It starts by generating JSON data with node IDs and values, writes these values to specified OPC UA nodes, reads back the values from the same nodes, and maps the results.


OPC UA Write Read Example Pipeline Overview

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Prerequisites

  1. Configure the JSON Generator Snap with the following data containing node IDs and values of different data types (Integer, Boolean, Byte, DateTime, and Double). 
    
              [{
                   "nodeId": "ns=3;i=1007",
                   "value": 2
                 },
                 {
                   "nodeId": "ns=5;s=BooleanDataItem",
                   "value": false
                 },
                 {
                   "nodeId": "ns=5;s=ByteDataItem",
                   "value": 1
                 },
                 {
                   "nodeId": "ns=5;s=DateTimeDataItem",
                   "value": "2024-05-15T10:30:00+05:30"
                 },
                 {
                   "nodeId": "ns=5;s=DoubleDataItem",
                   "value": 1.2
               }
              ]

    Each object in this array represents a node in an OPC UA server.

  2. Configure the OPC UA Write Snap to write values to specified OPC UA nodes using the Node ID and Value from the upstream JSON input.


    On validation, the Snap writes the following output, which indictes that the values were successfully written to the specified nodes in the OPC UA server. In OPC UA, a status code of 0 (Good) is the best possible outcome, indicating that the operation completed without any issues or warnings.


    OPC UA Write Snap output

  3. Configure the OPC UA Read Snap to read values from the specified OPC UA nodes using the Node ID.
    OPC UA Read Snap Configuration

    On validation, the Snap reads data from all nodes and displays the following output. The successful status codes across all readings indicate that the OPC UA Read operation completed without any issues for all nodes.


    OPC UA Read Snap output

  4. Configure the Mapper Snap to map the final output (Node ID, Value, and Status code fields) for downstream use.
    Mapper configuration
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  1. Download and import the pipeline in to the SnapLogic Platform.
  2. Configure Snap accounts, as applicable.
  3. Provide pipeline parameters, as applicable.