Applies To:
  • CitectSCADA 5.41 Service Pack A
  • CitectHMI 5.41 Service Pack A

Citect crashes when reading variable tags from a CTICMP I/O device. The following error is displayed:

"Citect has performed an illegal operation and will be closed by windows"

The file c:\winnt\drwtsn32.log contains the exception address: 0x02c51213

If Citect is restarted without rebooting the PC, the CTICMP device(s) may be offline.


This problem was seen on Windows 2000 Service Pack 2. Installing Windows 2000 Service Pack 3 corrected it.