gOPCUAConnector.gWriteOneItem Method

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Description

Writes new value to a single OPC Node synchronously.

This synchronous operation may freeze your application until the end of operation.

 

VB syntax

gOPCUAConnector.gWriteOneItem(ByRef itemToWrite() As gOPCUAReadWriteObject)

 

C# syntax

gOPCUAConnector.gWriteOneItem(ref gOPCUAReadWriteObject itemToWrite)

 

Parameters

ItemToWrite

ReadWriteObject that holds NodeID and value you want to write.

 

Return Type

gOPCUAStatusCode

 

C# code example

  try

            {

                //Step1: Create a read-write object , assign NodeID and assign value to write

                GelecekCommon.gOPCUAReadWriteObject read_write_obj = new GelecekCommon.gOPCUAReadWriteObject();

                read_write_obj.NodeID = txtNodeID1.Text;

                read_write_obj.Value = txtValue1.Text;  //Be careful Text should be able to convert to data type of OPC Node

 

                //Step2: Run gWriteOneItem method 

                GelecekCommon.gOPCUAStatusCode function_result = gOPCUAConnector1.gWriteOneItem(ref read_write_obj);

 

                //Step3: Check function result and status code to be sure about a successfull writing

                //For a successfull write, function result should be "Good" , status code sould be "Good" 

 

                txtFunctionResult.Text = function_result.ToString();

                txtStatusCode1.Text = read_write_obj.StatusCode.ToString();

 

                if (function_result != GelecekCommon.gOPCUAStatusCode.Good || read_write_obj.StatusCode != GelecekCommon.gOPCUAStatusCode.Good)

                {

                    MessageBox.Show("OPC UA Connector Tutorial Project: Error in writing");

                }

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message);

            }