Last modified on 20 November 2014, at 08:08

AccessOPCUAVariable (Activity)

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Configure OPC UA Variable
Name AccessOPCUAVariable
Purpose Read or write a single OPC UA variable
Category UBIK OPC UA Interface
Returns True if successful
Version 2.4.1+

The AccessOPCUAVariable reads or writes a single OPC UA Variable that was previously configured within an OPC Connection.

Arguments

Argument Type Direction Purpose
Variable OpcUaVariable In The variable to read or write as produced by a Scope activity.
Value object In The value to write to the variable. If null, the variable will be read.
Connection OpcUaServerConnection In If the activity is not embedded with an Scope activity, a valid connection has to be specified.
Quality OpcUaQuality Out The quality of the accessed value as delivered by the OPC source
Result Boolean Out True if successful, false if failed

Usage

This activity is used to open a preconfigured OPC Connection. It is a nestable activity, which means it can host any amount of sub-activities that will be processed sequentially. The hosted activities are typically AccessOPCUAVariable activities, either as direct children but also wrapped within looping activities like ForEach or While. When all child activities are processed the OPC connection will be closed again.

Example

The CreateOPCUAScope activity, as used in the larger example "Read value from OPC variable":

UI Activity CreateOPCUAConnection Example.png

See also