Applies To:
  • CitectSCADA 6.10 and before

Possible driver crash when "maxbits" of 2048 is used for string tag types.

Each driver has a "protdir.dbf" setting which controls the maximum amount of tag grouping possible by Citect. A bug exists in the older code bases where a driver which has a protdir value of 2048, may have problems with string tags.


If this is identified as an issue, the work around is to change the protdir.dbf BIT_BLOCK and MAX_LENGTH to be 2040 bits (255 bytes). The file can be found in the citect32 "bin" directory. The protdir.dbf should be backed up before this change. A fresh project compile is then required.

This issue does not exist from v7 and beyond.