Applies To:
  • CitectSCADA 5.xx
Summary:
DevOpen() function with mode 8 does not return -1 when the device cannot be opened.

Only the first call to DevOpen() with mode 8 will return -1, after that calling DevOpen() again with any mode will return a valid handle.

 

Solution:
CIT has confirmed this to be a problem in Citect for Windows versions 5.20 to 5.21. This problem has been fixed in version 5.21 Service Pack G. 
Keywords:
 

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