Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 213)

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Work with Symbols
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FactoryTalk Historian Annotations Maintenance
Annotations allow you to associate related information (such as text
comments and other binary data) with any archive value. The FactoryTalk
Historian Annotation Maintenance group at the bottom of the Details
window (page 191) allows you to easily annotate values on your dynamic
symbols.
Annotations can be added, edited or viewed, provided that:
 The selected data stream points to a FactoryTalk Historian tag.
 The target FactoryTalk Historian server can read and write
annotations.
 You have permission to write annotations on the target FactoryTalk
Historian server.
 A row representing an event is selected in the Data table.
If the target FactoryTalk Historian server (or collective) is unavailable or
cannot accept edits from the current user, the control is disabled. If the
FactoryTalk Historian server becomes unavailable while you are entering
an annotation and you then click the Save button, you will receive an error.