Online Forums
Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.
Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.
Do not use the Contact page for technical issues.
×
If you are developing in .NET, but are using the OPC-UA (OPC Unified Architecture), please post in the QuickOPC-UA category instead.
QUICKopc Client application missing the values and not retaining back
18 Mar 2018 04:27 - 19 Mar 2018 08:06 #6156
by SENTHILKUMAR
Replied by SENTHILKUMAR on topic QUICKopc Client application missing the values and not retaining back
Dear Z,
thanks for continuing support. as per your guidance, we started using OPC DA subscription. the application working fine and no more issue of *pp Error or thread terminations. and also application also running continuously for last 15 days.
In this 15 days, we observed process memory is increasing in the task manager. while we starting the application we observed the process memory was around
the process memory keeps increasing. for your observation, we attached screenshots.
the subscribe function we are using is below
the event handler
we could not understand why process memory need to increase. we checked with visual studio memory utilty, there also memory keeps increasing.
we are unsubscribing while quiting the appllicaytion. please find below unsubscribe
please clarify us why process memory is increasing?
how to avoid the issue in OPC-DA SUBSCRIPTION?
thanks for continuing support. as per your guidance, we started using OPC DA subscription. the application working fine and no more issue of *pp Error or thread terminations. and also application also running continuously for last 15 days.
In this 15 days, we observed process memory is increasing in the task manager. while we starting the application we observed the process memory was around
the process memory keeps increasing. for your observation, we attached screenshots.
the subscribe function we are using is below
static void SubscribeOPCTagValues()
{
int count = GloabalVariables.TagCollection.ToArray().Length;
string[] TagSubArray = GloabalVariables.TagCollection.ToArray();
var argumentArray = new DAItemGroupArguments[count];
//server descriptor need to define
try
{
if (GloabalVariables.TriggerSubscribe)
{
LogWriter(" Start subscribing");
easyOPCClient.ItemChanged += easyDAClient_ItemChanged;
for (int i = 0; i < count; i++)
argumentArray[i] = new DAItemGroupArguments(HostName, ServerClass, GloabalVariables.TagCollection[i], 10000, null);
easyOPCClient.SubscribeMultipleItems(argumentArray);
}
}
catch(Exception e)
{
Console.WriteLine("Error while subscribe items" + e.Message);
ErrorLogWriter("Error while subscribe items "+e.Message);
}
finally
{
GloabalVariables.TriggerSubscribe = false;
}
return;
}static void easyDAClient_ItemChanged([NotNull] object sender, [NotNull] EasyDAItemChangedEventArgs e)
{
string string1;
string[] splitString1;
Console.WriteLine("{0}: {1}", e.Arguments.ItemDescriptor.ItemId, e.Vtq);
if(e.Exception != null)
{
Console.WriteLine(" Error at Event Handler" + e.Exception);
ErrorLogWriter(" Error at Event Handler" + e.Exception);
}
else
{
//LogWriter(e.Arguments.ItemDescriptor.ItemId + " " + e.Vtq.ToString());
string1 = Convert.ToString(e.Vtq);
splitString1 = string1.Split(' ');
GloabalVariables.SystemTime = DateTime.Now;
// Console.WriteLine("The time of subscribe :" + GloabalVariables.SystemTime);
if (GloabalVariables.TotalTagsSubcribed < GloabalVariables.TagCollection.Count)
{
GloabalVariables.ReadableTags.Add(GloabalVariables.TagCollection.IndexOf(e.Arguments.ItemDescriptor.ItemId));
if (string1.Length > 30)
{
GloabalVariables.QualityCollection.Add("GOOD");
if (splitString1[1] == "{System.Boolean}")
{
GloabalVariables.BooleanTagCollection.Add(e.Arguments.ItemDescriptor.ItemId);
if (splitString1[0] == "False")
GloabalVariables.BooleanValueCollection.Add(false);
else
GloabalVariables.BooleanValueCollection.Add(true);
}
else
{
GloabalVariables.DoubleTagCollection.Add(e.Arguments.ItemDescriptor.ItemId);
GloabalVariables.DoubleValueCollection.Add(Convert.ToDouble(splitString1[0]));
}
GloabalVariables.TotalTagsSubcribed++;
}
}
else
{
int BoolIndex = GloabalVariables.BooleanTagCollection.IndexOf(e.Arguments.ItemDescriptor.ItemId);
if(BoolIndex < 0)
{
int DoubleIndex = GloabalVariables.DoubleTagCollection.IndexOf(e.Arguments.ItemDescriptor.ItemId);
GloabalVariables.DoubleValueCollection[DoubleIndex] = Convert.ToDouble(splitString1[0]);
}
else
{
if (splitString1[1] == "{System.Boolean}")
{
if (splitString1[0] == "False")
GloabalVariables.BooleanValueCollection[BoolIndex] = false;
else
GloabalVariables.BooleanValueCollection[BoolIndex] = true;
}
}
GloabalVariables.TotalTagsSubcribed++;
if(GloabalVariables.TotalTagsSubcribed > GloabalVariables.ReadableTags.Count)
{
Console.WriteLine(" The length of Total readable tags {0}", GloabalVariables.ReadableTags.Count);
// Console.WriteLine(" Total subscribed count {0}", GloabalVariables.TotalTagsSubcribed);
GloabalVariables.TotalTagsSubcribed = GloabalVariables.ReadableTags.Count + 1;
}
}
}
}
we could not understand why process memory need to increase. we checked with visual studio memory utilty, there also memory keeps increasing.
we are unsubscribing while quiting the appllicaytion. please find below unsubscribe
static void UnSubscribeOPCTagValues()
{
try
{
if (!GloabalVariables.TriggerSubscribe)
{
LogWriter("UNsubscribing");
easyOPCClient.UnsubscribeAllItems();
easyOPCClient.ItemChanged -= easyDAClient_ItemChanged;
Thread.Sleep(1000);
}
}
catch(Exception e)
{
Console.WriteLine("Error while unsubscribe items " + e.Message);
ErrorLogWriter("Error while unsubscribe items " + e.Message);
}
finally
{
GloabalVariables.TriggerSubscribe = true;
}
return;
}how to avoid the issue in OPC-DA SUBSCRIPTION?
Please Log in or Create an account to join the conversation.
Moderators: support
Time to create page: 0.097 seconds