Applies To:
  • CitectSCADA 5.xx, 6.xx
  • CitectHMI 5.xx, 6.xx
Summary:
When using redundant servers, I have noticed that my device files roll over twice, i.e. with two files getting created at the same time.
 

Solution:
This problem occurs when devices on redundant servers point to the same files. E.g. you can have the filename of your device pointing to a file server from each Citect Server. This problem is observed to generally occur when the INI parameter:

[Device]
AlwaysCreateHistory =1

is set on both servers. As a consequence of this INI parameter, Citect will force the creation of the device files from each Citect server, hence if you have the device files from each server pointing to the same location, this will cause a double roll over of history files.

We would recommend setting up your devices in an alternative location.  However, if you want to work around the issue, you can do the following:

1. Have [Device]AlwaysCreateHistory=1 set only on one server.
2. Make sure that the last server that you start in your system is the one with [Device]AlwaysCreateHistory=0

 
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