实例介绍
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
【核心代码】
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 | 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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