Applies To:
  • CitectSCADA 3.xx, 4.xx, 5.xx
Summary:
When you have more than 512 I/O Devices in a Citect database then a hardware alarm for an I/O Device may be reported as being for another I/O Device.  Also ErrSetHw/ErrGetHw will not work correctly when there are more than 511 I/O Devices in the database.  To correct this the mask for I/O Devices passed into this function (i.e.. the number added to the I/O Device number) has been changed from 512 to 8192.  The old mask of 512 can still be used by setting

[Code]

BackwardCompatibleErrHw=1

in your configuration file. However with backward compatible mode you will only be able to have ErrSetHw/ErrGetHw work correctlty with 511 IODevices or less in your database.

 

Solution:
CIT has confirmed this to be a problem in Citect for Windows versions 3.XX to 5.XX. This problem has been fixed in version 5.21 Service Pack A. 
Keywords:
 

Attachments