Uninstalling Historian

For information on uninstalling OPC Data Collectors, refer to the Modifying and Uninstalling OPC Collectors section of the Historian Data Collectors manual.

• When you want to uninstall Web-based Clients:
  • If you select the Purge database during uninstall check box, the entire database will be purged, and you must recreate the UAA details, favourites, and so on. Therefore, if you want to retain UAA details, do not select that check box.
  • If you have installed Operations Hub on the same machine, and if there is a shared UAA package between Operations Hub and Web-based Clients, in some cases, a message appears, asking you to first uninstall Operations Hub before uninstalling Web-based Clients. You can, however, uninstall Web-based Clients first; the shared UAA package will not be deleted in that case.

• If you uninstall Historian after installing the Excel Add-In as described, ensure that you clear the Historian check box in the Microsoft Excel Add-Ins window. If you do not clear this option, you will receive an error each time you open Microsoft Excel.

• If you want to uninstall collectors, delete all the instances of the collectors that you have created. You can do so using Configuration Hub or Remote Collector Management. The following instances of collectors (the ones that were created during the installation of collectors) are deleted automatically:
  • The iFIX collector
  • The iFIX Alarms & Events collector
  • The OPC Classic Data Access collector for CIMPLICITY
  • The OPC Classic Alarms and Events collector for CIMPLICITY
  Even after you uninstall collectors and Web-based Clients, the corresponding Windows services and registry entries are not removed.