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Notes on Deleted Tags in Calculation Formulas

You can reference a deleted tag in a calculation formula, without an error appearing. For instance, you could enter a formula such as Result=CurrentValue("DeletedTag"), where DeletedTag is the name of the deleted tag. You can do this because when you delete a tag, Historian removes deleted tags from the Tag Database (so you cannot browse for it), but it retains the data for that tag in the archive.

However, it is recommended that you do not reference deleted tag names in your calculation formulas, because if the archive files are removed with the data for the deleted tag, the calculation will not work properly.