Applies To:
  • CitectSCADA 5.xx

A TagRead() may fail when used on variable tags being accessed with the OPC or DDE protocol drivers with the hardware error 259 'General' 'Array has been overrun'. 

TagWrite() will fail when the tag has an '[' (open square bracket) followed by a non numeric character or '0' (zero) as part of the address. The DDE driver (that is both DDEDRV & DDEDRV2) and OPC entries in protdir.dbf need to have the OPTIONS field set to 0x0880CF. This is supported in the OPC V1.07.02.188 or later.