Hi,
Yes, first try MickeyBob’s suggestion. Also, which OPC server are you using? Is it running on the same machine as FactorySQL? What type of devices are providing the data? Finally, are the data types of the items correct in FactorySQL? Sometimes with certain OPC servers the datatype doesn’t come across well on the drag-drop, and they get set to String, which might cause problems.
Regards,