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How to configure trends tags for storing trend files for a fixed period.

The configuration of the trend file is should be like as described in the below: 

You need to put the following Trend Tag Configuration settings for generating a trend files for the required period ( for example 3 months),
 

Storage Method: Floating Point (8-byte samples) 
No. Files : 90 
Time : 00:00:00 
Period : 24:00:00 ( considering 1 file for a day)

Or 

Storage Method: Floating Point (8-byte samples) 
No. Files : 3 
Time : 00:00:00 
Period : 1st ( considering 1 file for a month)

So we would recommend to follow these settings in trend tag configurations and first try them on some spare system and then apply on
the plant system as after the configurations are changed in trend files you will need to delete the old trend files.
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