Dear Z,
Issue : OPC Client Application is running continuously. but at some instance, it missing the communication and its not recovering the communication back.
the required details we shared below
we are owned license for Quick OPC .please find below Quick OPC version detail. Version : 5.51
we have below set of Queries
.
1. Currently the deployment machine has .NET Framework 4.6. whether any other packages need to update in deployment machine??
we had a active license for Quick OPC Application
2. Our OPC Client Application is running continuously. but at some instance, it missing the communication and its not recovering the communication back.. we need your expertise in resolving the issue.
please find below our code.
Variable deceleration :
Code:
static readonly EasyDAClient easyOPCClient = new EasyDAClient();
initialize application:
Code:
easyOPCClient.Isolated = true;
easyOPCClient.InstanceParameters.Timeouts.ReadItem = 30000;//set 30 seconds timeout for read item
easyOPCClient.InstanceParameters.Mode.AllowAsynchronousMethod = false;
easyOPCClient.InstanceParameters.UpdateRates.ReadAutomatic = Timeout.Infinite;
easyOPCClient.InstanceParameters.UpdateRates.WriteAutomatic = Timeout.Infinite;
reading OPC Values:
Reading OPC Values in infinite loop for every 10 seconds interval. the OPC values logging in text file at an interval of 10 seconds. continuously logging in the text file.
please find below function as it is
Code:
static void ReadOPCTagValues()
{
int count = GloabalVariables.TagCollection.ToArray().Length;
string[] TagSubArray = GloabalVariables.TagCollection.ToArray();
DAItemDescriptor[] subarray = new DAItemDescriptor[GloabalVariables.TagCollection.ToArray().Length];
var ServerDetail = new OpcLabs.EasyOpc.ServerDescriptor();
Console.WriteLine("Variable initialization Completed");
LogWriter(" OPC Funtion : Varibale initialization completed");
try
{
for (int i = 0; i < count; i++)
subarray[i] = new DAItemDescriptor(TagSubArray[i]);
Console.WriteLine("Deccriptor creation Completed");
LogWriter(" OPC Funtion : Deccriptor creation completed");
ServerDetail.MachineName = HostName;
ServerDetail.ObjectId = ServerClass;
EasyDAClient.SharedParameters.ClientParameters.UseCustomSecurity = false;
}
catch(Exception e)
{
Console.WriteLine("Deccriptor creation Exception" + e.Message);
ErrorLogWriter(" OPC Funtion : Deccriptor creation Exception" + e.Message);
}
try
{
StreamWriter WriteTagName = new StreamWriter(System.IO.Directory.GetCurrentDirectory().ToString() + @"\TagNamesWithDomain.txt", true);
WriteTagName.WriteLine(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:fff") + " Start Cycle : " + countCycle.ToString());
// Client. = true;
Console.WriteLine("OPC Funtion : Trying to connect");
LogWriter("OPC Funtion : Trying to connect");
//iterate over tagarray and create //TagSubArray
try
{
DAVtqResult[] vtqResults = easyOPCClient.ReadMultipleItems(ServerDetail, subarray);
Console.WriteLine("OPC Funtion :OPC Buffer reading Completed with mesage length " + vtqResults.Length);
LogWriter("OPC Funtion :OPC Buffer reading Completed with mesage length " + vtqResults.Length);
string string1;
Console.WriteLine("OPC Funtion :Disposed OPC Instant");
LogWriter("OPC Funtion :Disposed OPC Function");
for (int i = 0; i < vtqResults.Length; i++)
{
try
{
Debug.Assert(vtqResults[i] != null);
string1 = Convert.ToString(vtqResults[i].Vtq);
Console.WriteLine("Tag index [{0}].Tag Value:{1}", i, vtqResults[i].Vtq);
//Console.WriteLine(" lENGTH OF REC MESSAGE : " + string1.Length);
LogWriter(Convert.ToString(i) + " " + string1);
if (string1.Length > 30)
{
string[] splitString1 = string1.Split(' ');
GloabalVariables.QualityCollection.Add("GOOD");
GloabalVariables.ReadableTags.Add(i);
if (splitString1[1] == "{System.Boolean}")
{
//splitString1[0] = splitString1[0].Substring(0, 1);
if (splitString1[0] == "False")
GloabalVariables.BooleanValueCollection.Add(false);
else
GloabalVariables.BooleanValueCollection.Add(true);
}
else
{
GloabalVariables.DoubleValueCollection.Add(Convert.ToDouble(splitString1[0]));
}
Console.WriteLine(i + ". " + TagSubArray[i] + ": " + splitString1[0]);
WriteTagName.WriteLine(i + ". " + TagSubArray[i] + ": " + splitString1[0]);
}
else
{
GloabalVariables.QualityCollection.Add("BAD");
GloabalVariables.ErrorMessageCount++;
}
}
catch (IndexOutOfRangeException e)
{
// GloabalVariables.ErrorMessageCount++;
Console.WriteLine("Index out of range exception " + TagSubArray[i] + " " + e.Message);
Console.WriteLine("Recived Message : " + vtqResults[i].Vtq + "LENGTH OF MESSAGE = " + vtqResults[i].Vtq.ToString().Length);
ErrorLogWriter("OPC Funtion :" + "IndexOutOfRangeException" + e.Message );
}
catch (OpcException e)
{
// GloabalVariables.ErrorMessageCount++;
Console.WriteLine("OPC exception " + e.Message);
ErrorLogWriter("OPC Funtion :" + "OPC Exception" + e.Message);
}
catch (Exception e)
{
// GloabalVariables.ErrorMessageCount++;
Console.WriteLine(e.Message);
ErrorLogWriter("OPC Funtion :" + "General Exception" + e.Message);
}
finally
{
if (GloabalVariables.ErrorMessageCount > (vtqResults.Length - 1))
{
GloabalVariables.ErrorMessageCount = 0;
GloabalVariables.QualityCollection.Clear();
GloabalVariables.ReadableTags.Clear();
GloabalVariables.BooleanValueCollection.Clear();
GloabalVariables.DoubleValueCollection.Clear();
easyOPCClient.Reset();
easyOPCClient.Isolated = true;
easyOPCClient.InstanceParameters.Timeouts.ReadItem = 30000;//set 20 seconds timeout for read item
easyOPCClient.InstanceParameters.Mode.AllowAsynchronousMethod = false;
easyOPCClient.InstanceParameters.UpdateRates.ReadAutomatic = Timeout.Infinite;
easyOPCClient.InstanceParameters.UpdateRates.WriteAutomatic = Timeout.Infinite;
//clearBuffers();
GloabalVariables.ReInitialise = true;
}
}
}
}
catch (OpcException e)
{
Console.WriteLine("OPC exception " + e.Message);
ErrorLogWriter(" Read OPC Value : OPCException" + e.Message);
}
catch (FileNotFoundException e)
{
Console.WriteLine("OPC exception " + e.Message);
ErrorLogWriter(" Read OPC Value : FileNotFoundException" + e.Message);
}
catch (Exception e)
{
Console.WriteLine("OPC exception " + e.Message);
ErrorLogWriter(" Read OPC Value : General Exception" + e.Message);
}
WriteTagName.WriteLine(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:fff") + " End Cycle :" + countCycle.ToString());
Console.WriteLine(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:fff") + " End Cycle :" + countCycle.ToString());
WriteTagName.Close();
countCycle++;
System.Threading.Thread.Sleep(1300);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
ErrorLogWriter(" Read OPC Value : General Exception" + e.Message);
}
finally
{
}
return;
}
Closing of application:
while closing the application, we are disposing the OPC DA Client instance.
Code:
easyOPCClient.Dispose();
Let us know any other details required.
we are struggling to fix the issue. please kindly share your help to overcome the issue.
Topic Author
