Hi,

Thank you for your prompt response.

I am using QuickOPC 5.2. I just purchased the product last week so I believe that I am using the
latest release. I believe that this problem was network related and not an issue with your product.

When the failures were happening, I was developing and testing my code from our corporate domain. The control system on which our OPC server resides is actually a subdomain of the corporate domain. Now that I moved my development PC to the actual control system domain, I am not longer experiencing these issues.

Again, thank you for your quick reply.

I have written several classes with the general format shown below. Most of the DAItemDescriptor[] objects have between 25 and 30 elements. (The one shown below has less for brevity.) I am instantiating these classes and using them as shown at the bottom of the page. I instantiate six different classes, each similar to this one, and return the DAVtqResult[] for each. (These are done consecutively in my program.) The problem that I am having is that after two (2) or three (3)returns of the DAVtqResult[], I start getting failures. (Failure -1073430509 (0xC004C013): Read not completed) Each of these classes work individually, and if I rearrange their order, the first two always work. For example, if I have six classes named Class1, Class2, Class3, Class4, Class5, and Class6, and I call them in the orders shown below, this is how they behave.

Class1 - works
Class2 - works
Class3 - may or may not work - may have some failures and some successes or all failures
Class4 - may or may not work - may have some failures and some successes or all failures
Class5 - may or may not work - may have some failures and some successes or all failures
Class6 - may or may not work - may have some failures and some successes or all failures

or if I call them in this order

Class5 - works
Class6 - works
Class1 - may or may not work - may have some failures and some successes or all failures
Class2 - may or may not work - may have some failures and some successes or all failures
Class3 - may or may not work - may have some failures and some successes or all failures
Class4 - may or may not work - may have some failures and some successes or all failures

or if I call them in this order

Class3 - works
Class4 - works
Class5 - may or may not work - may have some failures and some successes or all failures
Class6 - may or may not work - may have some failures and some successes or all failures
Class1 - may or may not work - may have some failures and some successes or all failures
Class2 - may or may not work - may have some failures and some successes or all failures

Is there something that I am not doing correctly? Thank you for any guidance you can give.

// C# code
using OpcLabs.EasyOpc.DataAccess;

namespace WpfHost
{
class ExtruderExam
{
public DAVtqResult[] AllExtruders;

public ExtruderExam ()
{
AllExtruders = checkExtruders();
}

private DAVtqResult[] checkExtruders()
{
// Create the OPC Client object
EasyDAClient easyDAClient = new EasyDAClient();

// Create an OPC Server object
OpcLabs.EasyOpc.ServerDescriptor opcServer = new OpcLabs.EasyOpc.ServerDescriptor("04PRDP1S", "OPCServer.WinCC.1");

// Create all the items to read
DAItemDescriptor[] allItems = new DAItemDescriptor[4];

allItems[0] = new DAItemDescriptor("L1_OVERVIEW/L1_EXTRUDERS/L1_EXTRUDER1/DRV_EX1/MTR.Fwd#Value");
allItems[1] = new DAItemDescriptor("L1_OVERVIEW/L1_EXTRUDERS/L1_EXTRUDER2/DRV_EX2/MTR.Fwd#Value");
allItems[2] = new DAItemDescriptor("L1_OVERVIEW/L1_EXTRUDERS/L1_EXTRUDER3/DRV_EX3/MTR.Fwd#Value");
allItems[3] = new DAItemDescriptor("L1_OVERVIEW/L1_EXTRUDERS/L1_EXTRUDER4/DRV_EX4/MTR.Fwd#Value");

// Declare the object that will hold all the info for the tags being read
DAVtqResult[] allTags = easyDAClient.ReadMultipleItems(opcServer, allItems);

return allTags;
}
}
}


private List<string> _CurrentExtruderValues = new List<string>();
private string _ExtruderValues = "";

DAVtqResult[] AllExtruders = new ExtruderExam().AllExtruders;

for (int i = 0; i < AllExtruders.Length; i++)
{
_ExtruderValues += (AllExtruders.Vtq.Value).ToString() + ";";
}

_CurrentExtruderValues.Add(_ExtruderValues);