Currently one of our site I am facing the strange issue. I am getting the data from SCADA through OPC. there i am getting data for some tags is correctly. but some of my tags are giving the I/O Timeout. but if the value of the tags which is showing i/o timeout changes into the SCADA it shows me correct value. Means on value changes it is showing the data in that specific tag which is showing the i/o timeout. Mostly the values which are showing the correct are those tags which are simple AI values. if i connect any third party OPC tools i am able to browse data for I/O Timeout tags. Please advise how i can handle this issue.