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

If you run out of Windows System Resources, Citect and Windows will start to do strange things. Fonts may be displayed in the wrong typeface, icons may vanish and Citect or Windows may crash. Windows has a limitation of 64k of memory to be used for menus, windows, icons, fonts, bitmaps and other graphical information. When this memory runs out, windows (and any running applications) will start to fail.

You may check the amount of free system memory by displaying the About Dialog box in the Program Manager or by calling the Cicode function CitectInfo("memory", "", 1). The System Resources are shown as a %, Eg 60%, when it drops below 40%, fonts may start to change and as it gets below 20%, applications and Windows will start to fail. Citect does try to minimise its use of system memory to prevent you running out.

Your Citect configuration can consume system resources, by using lots of fonts, symbols and windows. Also, running many other applications at the same time can consume this system memory. 

If you are running low on System Resources, try to find out what is using all the resources. For example lots of applications running, large numbers of different fonts, lots of windows, bitmap object etc. Try to minimise your use of System Resources.

Note that as the System Resources are limited to a maximum of 64k in size, adding more memory to your computer will not get around this problem.