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ITUPG/NONE/NOC/OPC/NOC/NOC/NOC

product key :ITUPG/NONE/NOC/OPC/NOC/NOC/NOC.
The temperature controller communicating with the opc server with product code ITUPG/NONE/NOC/OPC/NOC/NOC/NOC is showing as 'Unknown quality' for a temperature value.Please advice me on the reasons behind the status 'Unknown quality'.
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