Applies To:
  • CitectSCADA 2.x, 3.x, 4.x, 5.x

Summary:
History files are sometimes not created, even though the device is set up as a History device. 

Solution:
History files are only created and rolled over at the appropriate time if the device is opened in Logging mode. Generally, the system takes care of which mode to open a device in, but there are some instances where the system will chose an inappropriate open mode. To rectify this, from 3.4/4.2 Service Pack E and 5.1, the system will now always open a History device in Logging mode.

A new parameter has been added which will override this. By setting the following parameter to 0, the system will revert to the old behaviour.

[Device]
ForceHistoryOpenMode=0


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