本实例，用于SIMATIC plc 通信，但修改实例可以与其他PLC进行通信,绝对可以运行！
DEMO1
DEMO2
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using Opc.Ua;using Opc.Ua.Client;using Siemens.UAClientHelper;namespace Siemens.OpcUA.SimpleClient{ public partial class MainForm : Form { #region Construction public MainForm() { InitializeComponent(); m_Server = new UAClientHelperAPI(); m_Server.CertificateValidationNotification = new CertificateValidationEventHandler(m_Server_CertificateEvent); } void m_Server_CertificateEvent(CertificateValidator validator, CertificateValidationEventArgs e) { // Accept all certificate -> better ask user e.Accept = true; } #endregion #region Fields private UAClientHelperAPI m_Server = null; private Subscription m_Subscription; private Subscription m_SubscriptionBlock; private UInt16 m_NameSpaceIndex = 0; #endregion /// <summary> /// Connect to the UA server and read the namespace table. /// The connect is based on the Server URL entered in the Form /// The read of the namespace table is used to detect the namespace index /// of the namespace URI entered in the Form and used for the variables to read /// </summary> private void btnConnect_Click(object sender, EventArgs e) { // Connect to the server try { // Connect with URL from Server URL text box m_Server.Connect(txtServerUrl.Text, "none", MessageSecurityMode.None, false, "", ""); // Toggle enable flag of buttons toggleButtons(true); } catch (Exception ex) { MessageBox.Show("Connect failed:\n\n" ex.Message); return; } // Read Namespace Table try { List<string> nodesToRead = new List<string>(); List<string> results = new List<string>(); nodesToRead.Add("ns=0;i=" Variables.Server_NamespaceArray.ToString()); // Read the namespace array results = m_Server.ReadValues(nodesToRead); if (results.Count != 1) { throw new Exception("Reading namespace table returned unexptected result"); } // Try to find the namespace URI entered by the user string[] nameSpaceArray = results[0].Split(';'); ushort i; for (i = 0; i < nameSpaceArray.Length; i ) { if (nameSpaceArray[i] == txtNamespaceUri.Text) { m_NameSpaceIndex = i; } } // Check if the namespace was found if ( m_NameSpaceIndex == 0 ) { throw new Exception("Namespace " txtNamespaceUri.Text " not found in server namespace table"); } } catch (Exception ex) { MessageBox.Show("Reading namespace table failed:\n\n" ex.Message); } } /// <summary> /// Disconnect from the UA server. /// </summary> private void btnDisconnect_Click(object sender, EventArgs e) { try { if (m_Subscription != null) { btnMonitor_Click(null, null); } if (m_SubscriptionBlock != null) { btnMonitorBlock_Click(null, null); } // Disconnect from Server m_Server.Disconnect(); // Toggle enable flag of buttons toggleButtons(false); } catch (Exception ex) { MessageBox.Show("Disconnect failed:\n\n" ex.Message); } } /// <summary> /// Reads the values of the two variables entered in the From. /// The NodeIds used for the Read are constructed from the identifier entered /// in the Form and the namespace index detected in the connect method /// </summary> private void btnRead_Click(object sender, EventArgs e) { try { List<string> nodesToRead = new List<string>(); List<string> results = new List<string>(); // Add the two variable NodeIds to the list of nodes to read // NodeId is constructed from // - the identifier text in the text box // - the namespace index collected during the server connect nodesToRead.Add(new NodeId(txtIdentifier1.Text, m_NameSpaceIndex).ToString()); nodesToRead.Add(new NodeId(txtIdentifier2.Text, m_NameSpaceIndex).ToString()); // Read the values results = m_Server.ReadValues(nodesToRead); txtRead1.Text = results[0]; txtRead2.Text = results[1]; } catch (Exception ex) { MessageBox.Show("Read failed:\n\n" ex.Message); } } /// <summary> /// Starts the monitoring of the values of the two variables entered in the From. /// The NodeIds used for the monitoring are constructed from the identifier entered /// in the Form and the namespace index detected in the connect method /// </summary> private void btnMonitor_Click(object sender, EventArgs e) { // Check if we have a subscription // - No -> Create a new subscription and create monitored items // - Yes -> Delete Subcription if (m_Subscription == null) { try { // Create subscription m_Subscription = m_Server.Subscribe(1000); m_Server.ItemChangedNotification = new MonitoredItemNotificationEventHandler(ClientApi_ValueChanged); btnMonitor.Text = "Stop"; // Create first monitored item m_Server.AddMonitoredItem(m_Subscription, new NodeId(txtIdentifier1.Text, m_NameSpaceIndex).ToString(), "item1", 100); // Create second monitored item m_Server.AddMonitoredItem(m_Subscription, new NodeId(txtIdentifier2.Text, m_NameSpaceIndex).ToString(), "item2", 100); } catch (Exception ex) { MessageBox.Show("Establishing data monitoring failed:\n\n" ex.Message); } } else { try { m_Server.RemoveSubscription(m_Subscription); m_Subscription = null; btnMonitor.Text = "Monitor"; txtMonitored1.Text = ""; txtMonitored2.Text = ""; } catch (Exception ex) { MessageBox.Show("Stopping data monitoring failed:\n\n" ex.Message); } } } /// <summary> /// Callback method for data changes from the monitored variables. /// The text boxes for the output of the values or status information are passed /// to the client API as clientHandles and contained in the callback /// </summary> private void ClientApi_ValueChanged(MonitoredItem monitoredItem, MonitoredItemNotificationEventArgs e) { try { if (this.InvokeRequired) { this.BeginInvoke(new MonitoredItemNotificationEventHandler(ClientApi_ValueChanged), monitoredItem, e); return; } MonitoredItemNotification notification = e.NotificationValue as MonitoredItemNotification; if (notification == null) { return; } if (monitoredItem.DisplayName == "item1") { // Get the according item txtMonitored1.Text = notification.Value.WrappedValue.ToString(); } if (monitoredItem.DisplayName == "item2") { // Get the according item txtMonitored2.Text = notification.Value.WrappedValue.ToString(); } if (monitoredItem.DisplayName == "itemBlock1") { // Get the according item txtReadBlock.Text = notification.Value.WrappedValue.ToString(); } } catch (Exception ex) { MessageBox.Show("Unexpected error in the data change callback:\n\n" ex.Message); } } /// <summary> /// Write the value of the first variable entered in the From. /// The NodeId used for the Write is constructed from the identifier entered /// in the Form and the namespace index detected in the connect method /// </summary> private void btnWrite1_Click(object sender, EventArgs e) { writeNewValue( new NodeId(txtIdentifier1.Text, m_NameSpaceIndex), // NodeId = identifier namespace index txtWrite1.Text); // Value to write as string } /// <summary> /// Write the value of the second variable entered in the From. /// The NodeId used for the Write is constructed from the identifier entered /// in the Form and the namespace index detected in the connect method /// </summary> private void btnWrite2_Click(object sender, EventArgs e) { writeNewValue( new NodeId(txtIdentifier2.Text, m_NameSpaceIndex), // NodeId = identifier namespace index txtWrite2.Text); // Value to write as string } /// <summary> /// Helper function to writing a value to a variable. /// The function /// - reads the data type of the variable /// - converts the passed string to the data type /// - writes the value to the variable /// </summary> private void writeNewValue(NodeId nodeToWrite, string valueToWrite) { try { List<string> nodesToWrite = new List<string>(); List<string> values = new List<string>(); nodesToWrite.Add(nodeToWrite.ToString()); values.Add(valueToWrite); m_Server.WriteValues(values, nodesToWrite); } catch (Exception ex) { MessageBox.Show("Writing new value failed:\n\n" ex.Message); } } private void btnMonitorBlock_Click(object sender, EventArgs e) { // Check if we have a subscription // - No -> Create a new subscription and create monitored item // - Yes -> Delete Subcription if (m_SubscriptionBlock == null) { try { // Create subscription m_SubscriptionBlock = m_Server.Subscribe(1000); btnMonitorBlock.Text = "Stop"; // Create first monitored item m_Server.AddMonitoredItem(m_SubscriptionBlock, new NodeId(txtIdentifierBlockRead.Text, m_NameSpaceIndex).ToString(), "itemBlock1", 100); } catch (Exception ex) { MessageBox.Show("Establishing block monitoring failed:\n\n" ex.Message); } } else { try { m_Server.RemoveSubscription(m_SubscriptionBlock); m_SubscriptionBlock = null; btnMonitorBlock.Text = "Monitor Block"; txtReadBlock.Text = ""; } catch (Exception ex) { MessageBox.Show("Stopping block monitoring failed:\n\n" ex.Message); } } } private void btnWriteBlock1_Click(object sender, EventArgs e) { int writeLength = (int)Convert.ChangeType(txtWriteLength.Text, typeof(int)); byte[] rawValue = new byte[writeLength]; byte currentValue = 0; object writeValue; for (int i = 0; i < rawValue.Count(); i ) { rawValue[i] = currentValue; currentValue ; } writeValue = rawValue; writeNewBlockValue( new NodeId(txtIdentifierBlockWrite.Text, m_NameSpaceIndex), // NodeId = identifier namespace index writeValue); // Value to write as byte array } private void btnWriteBlock2_Click(object sender, EventArgs e) { int writeLength = (int)Convert.ChangeType(txtWriteLength.Text, typeof(int)); byte[] rawValue = new byte[writeLength]; byte currentValue = 255; object writeValue; for (int i = 0; i < rawValue.Count(); i ) { rawValue[i] = currentValue; currentValue--; } writeValue = rawValue; writeNewBlockValue( new NodeId(txtIdentifierBlockWrite.Text, m_NameSpaceIndex), // NodeId = identifier namespace index writeValue); // Value to write as byte array } /// <summary> /// Helper function to writing a value to a variable. /// The function /// - reads the data type of the variable /// - converts the passed string to the data type /// - writes the value to the variable /// </summary> private void writeNewBlockValue(NodeId nodeToWrite, object valueToWrite) { try { List<string> nodesToWrite = new List<string>(); List<string> values = new List<string>(); nodesToWrite.Add(nodeToWrite.ToString()); values.Add(valueToWrite.ToString()); m_Server.WriteValues(values, nodesToWrite); } catch (Exception ex) { MessageBox.Show("Writing new block value failed:\n\n" ex.Message); } } private void toggleButtons(bool isConnected) { // Toggle Connect / Disconnect buttons btnConnect.Enabled = !isConnected; btnDisconnect.Enabled = isConnected; // Toggle Textboxes txtServerUrl.Enabled = !isConnected; txtNamespaceUri.Enabled = !isConnected; // Toggle action buttons btnMonitor.Enabled = isConnected; btnRead.Enabled = isConnected; btnWrite1.Enabled = isConnected; btnWrite2.Enabled = isConnected; btnMonitorBlock.Enabled = isConnected; btnWriteBlock1.Enabled = isConnected; btnWriteBlock2.Enabled = isConnected; } }}
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