Applies To:
  • CitectSCADA 5.40
Summary:
When I try to restore a trend with TrnAddHistory() I get the error code 374 and I cannot display the data from the history file. I have used this successfully before. What is the problem? 

Solution:
The full cycle of trend files needs to exist before other trend files can be attached. Check you have not set [Trend]AllFiles parameter to 0 in your citect.ini file or your project. 
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