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We have a client that is reading values from the opc server continuously. After around 20 days the values stopped changing. When I did a demand read from the client application, the values still did not change. Once I added the tags again to the group they started changing.
The status of the opc item was good even if the values did not change which leads me to believe that the tags were existing in the opc server. Just thinking out loud, could it be that the opc server deactivated the tags in the group after a while? I am not sure why it did that and would appreciate any input. The client and the opc server are on the same machine which leads me to believe it is not a network issue. Could it be a COM issue? The opc server is on a windows 7 workstation. The opc server is run as an application not as a service. I also had the same connection via tunneler from a remote client and these tags stopped changing as well and the same pattern was observed.
The status of the opc item was good even if the values did not change which leads me to believe that the tags were existing in the opc server. Just thinking out loud, could it be that the opc server deactivated the tags in the group after a while? I am not sure why it did that and would appreciate any input. The client and the opc server are on the same machine which leads me to believe it is not a network issue. Could it be a COM issue? The opc server is on a windows 7 workstation. The opc server is run as an application not as a service. I also had the same connection via tunneler from a remote client and these tags stopped changing as well and the same pattern was observed.