OPC UA
Use the OPC UA connector to interact with OPC UA servers directly from your workflows. It enables you to browse the server address space, read and write node values, and navigate object hierarchies, allowing seamless integration.
Unlike the UI-based approach in Flow Classic, Flow Connect leverages Flow Script to programmatically browse nodes, read real-time process data, and write values to OPC UA server endpoints.
Managing Connector : Add, Edit, or Delete
Follow the steps in the link as a guideline for connector actions: Add, Edit, and Delete.
Configuration values
Agent Group
Specifies the agent group on which the connector will be executed.
Server Address
The OPC UA server endpoint URL to connect to (e.g., opc.tcp://hostname:4840).
Use Security
Determines whether to use a secure connection. When set to Yes, the Security Configuration options become available. Default: Yes.
Cache Metadata
When set to true, caches the OPC UA server metadata locally to improve performance on browseFolder and browseFromNode operations.
Application Name
The application name used to identify this client when connecting to the OPC UA server. Default: applicationName.
Application Uri
(Security enabled) The unique URI identifying this application instance. Required when security is enabled.
Application Certificate Store Path
(Security enabled) The file system path to the certificate store containing the application's own certificate.
Application Certificate Subject Name
(Security enabled) The subject name of the application certificate used for secure communication.
Application Certificate Thumbprint
(Security enabled) The thumbprint of the application certificate used for identification.
Trusted Peer Certificate Store Path
(Security enabled) The file system path to the certificate store containing trusted peer certificates.
Trusted Issuer Certificate Store Path
(Security enabled) The file system path to the certificate store containing trusted issuer (CA) certificates.
Rejected Certificate Store Path
(Security enabled) The file system path where rejected certificates are stored for review.
Check Domain
When set to true, validates that the server certificate's domain matches the server address. Default: true.
Additional Property String
Optional string for passing additional configuration properties to the connector. The properties must be provided using the exact XML format described in the linked documentation.
Operations
Lists the items inside a standard OPC UA server folder (e.g., ObjectsFolder, RootFolder). Think of it like opening a folder on your computer to see what's inside. You can optionally filter what types of items to show and cache the results for faster repeated lookups.
Lists the items connected to a specific node in the server. Similar to browseFolder, but instead of starting from a standard folder, you start from any known node and explore what's linked to it.
Reads the current value of a data point on the server by its node ID. For example, reading a sensor temperature or a machine status. Returns the value along with timestamps and a status indicating whether the read was successful.
Updates the value of a data point on the server. For example, setting a target temperature or toggling a switch. You provide the node to write to, the new value, and the data type. Returns a status indicating whether the write was successful.
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