Using CitectSCADA > Logging and Trending Data > Using Trend History Files > Storage method

Storage method

You can select the storage method to use for trend tags and SPC tags. You are given a choice of either Scaled or Floating Point. Scaled represents a 2-byte data storage method; floating point uses 8 bytes.

Floating point storage has a dramatically expanded data range in comparison to Scaled storage, allowing values to be more precise, but it also uses more disk space. Use scaled where compatibility with pre-V5.31 trend history files is necessary.

You can set the necessary storage method via the Trend Tag or SPC Tag properties form (press the F2 key to view the extended form). The storage method is set to Scaled by default.

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