The NETx Servers provide a standardized OPC UA (Unified Architecture) interface. OPC UA is one of the most important communication protocols for Industry and the IoT.
OPC UA installation
The OPC UA extension is available through the Extension Manager. When the studio is stopped, the Extension Manager can be started from the studio menu Extensions / Manager / Start extension manager...
- Open the Extension Manager on the PC where you have the Internet connection.
- Navigate to the "Not installed" tab. Select the "OPC UA". Afterwards, press the "Install" button.
After a successful installation the following confirmation dialog appears.
Finally, close the studio and reopen it again. This is required before the extension can be used.
Integrate data points from another OPC UA server
Adding servers:
The NETx Server provides an OPC UA client module to integrate data points from other OPC UA servers. After having installed the plugin, open the menu entrty Modules>OPC UA>Server definitions. Within this definition file, foreign OPC UA servers can be added. In the following example a another NETx Server Platform that is running as an OPC server is defined.
| Parameter | Description |
|---|---|
| Name | The given name of the OPC UA server in the NETx Server. The combination of name and path must be unique within this definition file. |
| Path | The generated path in the Item Tree. The combination of name and path must be unique within this definition file. |
| URL | The URL of the OPC UA Server. |
| Use Security | If set to true, a secure connection will be used to connect to the OPC UA server. |
| Add Unknown Certificates | If enabled, unknown certificates are accepted by the OPC UA client implementation. If disabled, the certificate must be trusted by this computer. A trusted certificate must be either an official certificate or the CA certificated must be located in the certificate store of the local computer (path "Local Computer\NETx BMS Platform"). |
| Username | If the OPC UA Server requires Authentication with a username and a password. |
| Password | If the OPC UA Server requires Authentication with a username and a password. |
| Write timestamps | Choose which timestamps shall be used for writing to OPC UA data points. |
Adding data points:
Now the OPC UA data points can be defined. This is done within the "Modules>OPC UA> Data point definitions" . In the following example, a data point from another NETx Server that is running as an OPC server is defined.
| Parameter | Description |
|---|---|
| Server Name | The full name of the OPC UA server. This must match the combination name and path from the server definitions. |
| Name | The name of the data point. The combination of name and path must be unique within this definition file. |
| Path | The generated path in Item Tree. The combination of name and path must be unique within this definition file. |
| Namespace Index | The index of the namespace URI in the namespace array. |
| NodeId Type | The type of the Node ID (by default String). |
| NodeId Value | The required data point ID. |
| Data type | The data type of the data point . |
| Access mode | read, read and write or write. |
| Persistent | This parameter specifies whether the value of the data point is persistent (restored from the database after server start up ) or not. |
Synchronize | If this parameter is set to “True (T)”, the value is synchronized between the main and backup server (if present). |
To determine the required namespace index, node id type, node id value and data type, you can use any 3rd party OPC UA client like UaExpert .
The added data points should appear in the Item Tree under the predefined Path: 
Fine tuning
To get data from OPC UA servers, the client has many different configuration options. This options are used for the connection establishment as well as for the data retrieval (OPC UA subscription service). The options can be changed within the OPC UA Client Configuration.
For troubleshooting, the log level of the OPC UA driver can be increased. The corresponding log entries are stored in a separate log file (<WorkspaceDirectory>\LogFiles\xio.OpcUa.log). More information about the configuration can be found in the OPC UA driver configuration.
Article applies to the following products:
- NETx BMS Platform
- NETx Multi Protocol Server
- NETx BMS Server 2.0