Hi

I attached the old thread, because I got last time an update in the library Version I am using, The new Versions of your library unfortunately it is not backward compatible, it means if I try to use the new library Version I would have to rewrite my complete application.

Anyway, could you explain what could be the reasons why the Problem is showing?

I run the function in a separate thread,

result = EasyDAClientWrite.WriteMultipleItemValues(Parameters);

where Parameters include the OPC items, and the values to be written, The function is not re-call if the thread is busy, in that way I dont overload the opc by performing several Write calls at the same time.

here is the configuration of my Client,

EasyDAClientWrite = new EasyDAClient();
EasyDAClientWrite.Isolated = true;

EasyDAClientWrite.InstanceParameters.Timeouts.ReadItem = 5000;
EasyDAClientWrite.InstanceParameters.Timeouts.WriteItem = 5000;
EasyDAClientWrite.InstanceParameters.UpdateRates.ReadAutomatic = 500;
EasyDAClientWrite.InstanceParameters.Mode.AllowAsynchronousMethod = true;
EasyDAClientWrite.InstanceParameters.Mode.AllowSynchronousMethod = true;
EasyDAClientWrite.InstanceParameters.Mode.DesiredMethod = DAReadWriteMethod.Asynchronous;

EasyDAClientWrite.SynchronizationContext = SynchronizationContext.Current;

I have been noticing that the new values take really long to be shown in the PLC, and if I check the result I got the error described in this thread. Here an example of my error Log file.


<Exception>
<TimeStamp>7/16/2019 2:03:16 PM</TimeStamp>
<ExceptionType>System.Runtime.InteropServices.COMException</ExceptionType>
<ExceptionData>
<OPCItem>/PhoenixContact.AX-Server.21/P3631_S4_XK3.w_Tab_service_function_MC2_9</OPCItem>
</ExceptionData>
<Message>Cannot connect topic (timeout). </Message>
<Source>OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient</Source>
</Exception>
<Exception>
<TimeStamp>7/16/2019 2:03:16 PM</TimeStamp>
<ExceptionType>System.Runtime.InteropServices.COMException</ExceptionType>
<ExceptionData>
<OPCItem>/PhoenixContact.AX-Server.21/P3631_S4_XK3.w_Tab_service_status_MC2_13</OPCItem>
</ExceptionData>
<Message>Write not completed. This error indicates that it could not be verified that the requested write operation was completed during the timeout period. It is possible that the write 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). </Message>
<Source>OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient</Source>
</Exception>
<Exception>
<TimeStamp>7/16/2019 2:03:16 PM</TimeStamp>
<ExceptionType>System.Runtime.InteropServices.COMException</ExceptionType>
<ExceptionData>
<OPCItem>/PhoenixContact.AX-Server.21/P3631_S4_XK3.w_Tab_service_status_MC2_12</OPCItem>
</ExceptionData>
<Message>Write not completed. This error indicates that it could not be verified that the requested write operation was completed during the timeout period. It is possible that the write 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). </Message>
<Source>OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient</Source>

Hi

I am having a similar problem, but I have installed the version QuickOPC 5.23_1371.1

Please check this www.opclabs.com/forum/browsing/1437-opcbrowsedialog-bug/2230?start=0

Best Regards
Luis Garcia