Citect SCADA 7.20 – Trend Only Showing Real-Time, No Historical Data.

Question

Hi everyone, 
 I'm using Citect SCADA version 7.20 and facing an issue where the trend system only shows real-time data. 
 Historical data is not appearing when I scroll back or try to view past time ranges. I've already followed all configuration steps as outlined in the official manual, including: 
 - Trend tags are configured with logging enabled - Log Device is set to `Trend` - Runtime is running without errors - Disk space is sufficient - No error messages appear in runtime or event logs 
 Is there anything else I might be missing? Do I need to manually configure file paths or trend file settings in this version? 
 Also, would upgrading to version 7.30 potentially resolve this issue? I&rsquo;d really appreciate any recommendations or tips from anyone who has experience with this. 
 Thanks in advance! **Sasin**

Patrick · Answer

Not sure what you mean by "... with logging enabled" and "Log Device is set to 'Trend' ". I can't recall these properties being a part of the trend tag configuration (although I haven't touched v7.20 in over ten years). It should be sufficient to define a Trend Tag that refers to a Variable Tag in its Expression field. 
 Do you see trend files being created in the Data folder? There should at least appear files that are named "<Trend Tag>.HST" and also files called *.000, *.001, etc. 
 As 7.20 is a very old version that does not officially support modern environments (for example current Windows versions), I would indeed recommend upgrading to a newer version. I would strongly advise to consider a version that is currently in active Support, such as v2023R2, and I would certainly avoid v7.30 if you can.

Patrick · Answer

The Device in your screenshot causes a major conflict with your Trend Tag. Both configurations will result in the creation of history files (*.000, *.001, etc.) with the exact same names, but totally different content (binary trend data vs.dBaseIII records). 
 I'm still not sure why you have defined this device. It is NOT needed for normal trend operation.

Citect SCADA 7.20 – Trend Only Showing Real-Time, No Historical Data.

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