Hello

You are right, now its working.

The AllowAsynchronousMethod says in definition "When true, asynchronous OPC reads and writes will be allowed".
This is my misunderstanding about the method.

Thanks very much

Jukka

Hello

I cannot modify my project because it need asynchronous write and read.
Only DAClient working with ABB.

Maybe we wait the response from ABB if there is something to do with license.

1. The server is remote ABB.AfwOpcDaSurrogate.
2. Remote.
3. The reading is possible if the user is same in client and server-side.
But in this case the server is not starting a new service. It using the existing server ABB.AfwOpcDaSurrogate.
We have created new user in client side and server side. A new server process is starting ABB.AfwOpcDaSurrogate.1 but the reading giving the error.
4. It happend always.
5. Half an hour.
6. Version QuickOPC 5.4.

I've also done a survey on ABB.

T:Jukka

Hello

This kind of problem come with ABB.AfwOpcDaSurrogate.1 - server.
Any ideas how to solve it ?

ErrorTxt:
2017-01-12 10:57:29 OpcLabs.EasyOpc.OperationModel.OpcException: An OPC operation failure with error code -1073430509 (0xC004C013) occurred, originating from 'OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient'. The inner exception contains details about the problem. ---> System.Runtime.InteropServices.COMException: Read not completed. This error indicates that it could not be verified that the requested read operation was completed during the timeout period. It is possible that the read operation will actually succeed or fail, but later. Increase the timeout period if you want to obtain positive or negative indication of the operation outcome. Other reason for this error may be that under heavy loads, topic request or response queue is overflowing. Check the event log for queue overflow errors (if event logging is supported by the product and enabled).
--- End of inner exception stack trace ---
at OpcLabs.EasyOpc.EasyUtilities.CheckSuccess(OperationResult operationResult)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.ReadItem(IEasyDAClient client, ServerDescriptor serverDescriptor, DAItemDescriptor itemDescriptor, DAReadParameters readParameters)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.ReadItem(IEasyDAClient client, ServerDescriptor serverDescriptor, DAItemDescriptor itemDescriptor)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.ReadItem(IEasyDAClient client, String machineName, String serverClass, String itemId, VarType dataType)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.ReadItem(IEasyDAClient client, String machineName, String serverClass, String itemId)
at EasyOpcNetDemo.MainForm.AloitaMallinnus_Click(Object sender, EventArgs e) in c:\Omat\Tyotw\Sin3PyrometriMallinnus\OPCToMysql_3\MainForm.cs:line 181

T: Jukka Kuikka