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OPC Server objects wont trend for more than a day

I am using the NI OPC Server and Lookout. On my trend charts, it seems that any of the objects from the OPC Server will not trend any longer than roughly a 24 hour period. Sometimes a little more sometimes a little less. I am also using Lookouts Modbus driver on the same trend and it has a log from the day I added it to the database. See example Hypertrend.

 

Any ideas why the data from OPC is lost?

 

Brian T. Kinard
President - SCADA and Security Division
2110 Nance Street
Newberry, SC 29108
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