Applies To:
  • CitectSCADA 1.00 1.01 1.10 1.11 1.20 2.00 2.01

If Citect detects a fatal error during the startup procedure, an abort shutdown will be executed. The abort shutdown procedure will only shutdown absolutely necessary systems and not other systems. This is done so there is greater chance of the shutdown completing correctly. As part of the normal shutdown procedure any driver DLL are normally removed from Windows Memory. In Citect for Windows versions 1.xx to 2.01 the unloading of DLLs was not considered essential and during a abort shutdown they where not removed from memory. So to remove these drivers from memory you where required to restart Windows.

This may have caused extra memory to be consumed and may cause problems the next time you try to startup Citect.


In version 2.10 and later Citect will remove all protocol DLLs from memory during an abort shutdown. If you are using versions before this and Citect executes an abort shutdown you should restart Windows to remove any DLLs from memory.