Applies To:
  • CitectSCADA v7.00 

HF700R138996 for CitectSCADA v7.0 R1.
Make sure you have installed the required version before installing this hotfix.

This hotfix is for:

Bug 38996 - Cannot write to some REAL disk plc tags with Modnet
protocol due to IOServer and DISKDRV blocking algorithm differences.

Due to differing IOServer and DISKDRV blocking algorithms, some IOServer calls
lead to multiple Disk Command calls. If the address of a REAL tag happens to
span two Disk Command blocks, then the REAL tag would fail validations checks.
The checks are instead now performed using the IOServer blocks.

Files Affected:

Diskdrv.dll        Make a copy of the existing Diskdrv.dll file in the Citect\bin folder and then
replace it with the file from this hotfix.