Campbell Scientific CR1000KD CR800 and CR850 Measurement and Control Systems - Page 410

Section 10. Troubleshooting 0 / 0 NAN 1 except Average() outputs NAN 2 except Average() outputs 0 NAN NAN 65535 2147483648 NAN TRUE TRUE -2147483648 10.3.4.4 Output Processing and NAN When a measurement or process results in NAN, any output process with DisableVar = FALSE that includes an NAN measurement, e.g., Average(1,TC_TempC,FP2,False) will result in NAN being stored as final-storage data for that interval. However, if DisableVar is set to TRUE each time a measurement results in NAN, only non-NAN measurements will be included in the output process. CRBasic example Using NAN to Filter Data (p. 410) demonstrates the use of conditional statements to set DisableVar to TRUE as needed to filter NAN from output processes. Note If all measurements result in NAN, NAN will be stored as final-storage data regardless of the use of DisableVar. CRBasic Example 68. Using NAN to Filter Data 'Declare Variables and Units Public TC_RefC Public TC_TempC Public DisVar As Boolean 'Define Data Tables DataTable(TempC_Data,True,-1) DataInterval(0,30,Sec,10) Average(1,TC_TempC,FP2,DisVar) EndTable 'Output process 'Main Program BeginProg Scan(1,Sec,1,0) 'Measure Thermocouple Reference Temperature PanelTemp(TC_RefC,250) 'Measure Thermocouple Temperature TCDiff(TC_TempC,1,mV20,1,TypeT,TC_RefC,True,0,250,1.0,0) 'DisVar Filter If TC_TempC = NAN Then DisVar = True Else DisVar = False EndIf 'Call Data Tables and Store Data CallTable(TempC_Data) NextScan EndProg 410