Rockwell Automation FactoryTalk Historian SE 3.0 Live Data Interface User Guide - Manual (Page 59)

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Error and Informational Messages
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Error Descriptions
The descriptions of system and PI errors can be obtained with the pidiag
utility. It is a command-line utility (pidiag.exe) located in the C:\Program
Files\Rockwell Software\FactoryTalk Historian\Server\PI\Adm directory.
The following is the syntax to retrieve error descriptions of the messages:
\PI\adm\pidiag -e error_num