C#連接OPC Server (Intouch 2014 R2 using Suitelink)

最近煩惱如何C#連接Intouch 2014 R2，並且要將Tag value寫入Intouch當中，對於我這個Intouch的菜鳥，這是非常的困難，但經過經驗人仕指導一番後就成功了。以下是一個分享：
先下載opcdaauto.dll，作為Project的Reference，再寫入下面經過改良的Class，當中不難看出Class包含連接OPC Server、創建Client Group及寫入Tag Value。

using OPCAutomation;

public class OPC
{
OPCServer KepServer;
OPCGroups KepGroups;
OPCGroup KepGroup;
OPCItems KepItems;
OPCItem KepItem;
string strHostIP = "";
string strHostName = "";
int itmHandleClient = 0;

public bool GetLocalServer()
{
  IPHostEntry IPHost = Dns.GetHostEntry(Environment.MachineName);
  if (IPHost.AddressList.Length > 0)
  {
    strHostIP = IPHost.AddressList[0].ToString();
  }
  else
  {
    MessageBox.Show("GetLocalServer Error 1");
    return false;
  }
  IPHostEntry ipHostEntry = Dns.GetHostEntry(strHostIP);
  strHostName = ipHostEntry.HostName.ToString();
  try
  {
   KepServer = new OPCServer();
   object serverList = KepServer.GetOPCServers();
   KepServer.Connect(((Array)serverList).GetValue(1).ToString(),"localhost");
  }
  catch(Exception ex)
  {
   MessageBox.Show("GetLocalServer Error 2 " + ex.Message);
   return false;
  }
  return true;
}

public bool CreateGroup()
{
  try
  {
    KepGroups = KepServer.OPCGroups;
    KepGroup = KepGroups.Add("MaxsonProgram");
    SetGroupProperty();
    KepGroup.DataChange += new   DIOPCGroupEvent_DataChangeEventHandler(KepGroup_DataChange);
   KepGroup.AsyncWriteComplete += new   DIOPCGroupEvent_AsyncWriteCompleteEventHandler(KepGroup_AsyncWriteComplete);
   KepItems = KepGroup.OPCItems;
  }
  catch (Exception err)
  {
   MessageBox.Show(err.Message, "CreateGroup提示信息", MessageBoxButtons.OK,     MessageBoxIcon.Warning);
   return false;
  }
  return true;
}

public void SetGroupProperty()
{
  KepServer.OPCGroups.DefaultGroupIsActive = true;
  KepServer.OPCGroups.DefaultGroupDeadband = 0;
  KepGroup.UpdateRate = 1000;
  KepGroup.IsActive = true;
  KepGroup.IsSubscribed = true;
}

void KepGroup_AsyncWriteComplete(int TransactionID, int NumItems, ref Array ClientHandles, ref Array Errors)
{
  MessageBox.Show("Success Write");
}

void KepGroup_DataChange(int TransactionID, int NumItems, ref Array ClientHandles, ref Array ItemValues, ref Array Qualities, ref Array TimeStamps)
{
}

public void opcWrite(string tagname, string value)
{
  try
  {
   Array Errors;
   int cancelID;
   KepItem = KepItems.AddItem(tagname, itmHandleClient);
   int[] temp2 = new int[2] { 0, KepItem.ServerHandle };
   Array serverHandles = (Array)temp2;
   object[] valueTemp = new object[2] { "", value };
   Array values = (Array)valueTemp;
   KepGroup.AsyncWrite(1, ref serverHandles, ref values, out Errors, 2009, out cancelID);
   KepItems.Remove(KepItems.Count, ref serverHandles, out Errors);
   GC.Collect();
 }
 catch (Exception ex) { MessageBox.Show(ex.Message); }
 }
}


如果想調用OPC Class，可依下面作為參考。

OPC opc = new OPC();
if (opc.GetLocalServer())
{
 if (opc.CreateGroup())
 {
   opc.opcWrite("SuiteLink.Topic.Test02", "30");   
   opc.opcWrite("SuiteLink.Topic.Rainfall_Value", "10.33"); 
   opc.opcWrite("SuiteLink.Topic.Rainfall_X", "123.456");  
   opc.opcWrite("SuiteLink.Topic.Rainfall_Y", "654.321");  
   opc.opcWrite("SuiteLink.Topic.WinterMode", "1");  
   opc.opcWrite("SuiteLink.Topic.NormalMode", "0");  
   opc.opcWrite("SuiteLink.Topic.TriggerLevel", "1.6");  
   opc.opcWrite("SuiteLink.Topic.RainingState", "0");
  }
} 
Intouch Setting如下：

Visual Studio Setting如下(.net 4.5 + 32 bit CPU)：(必須，我試了很多次，這是必須，否則會連接不上，這可是的花了很多時間得出來的結論)

如果設定成功及運行C# Application，你會在Intouch Viewer中看到Tag Value會改變，亦即代表你成功了。