Applies To:
  • CitectSCADA 1.00 1.01 1.10 1.11 1.20 2.00 2.01 3.00

We've come across an instance of a Digiboard installed into a clone PC which won't initialise at project startup. All memory/IRQ/port settings appear to be correct, with no clashes, and all cards have been removed from the machine apart from the bare essentials (video, I/O and HDD), yet the card still refuses to initialise. 

In this case, the Shadow BIOS option has been enabled for the memory area in which the Digiboard is operating. This appears to confuse the board, and it can't initialise properly. It can be turned off by going into the CMOS setup utility contained in the PC and finding the Shadow BIOS options (usually on an Advanced Settings page). For most clones, you can enter the setup utility by pressing <DEL> or <CTRL><ALT><ESC> during a cold boot. Unless there is a special requirement for another board in the PC, all the memory locations that have a shadowing option should be turned off. (Note that the System Shadow BIOS option available on some machines can usually be left on, as it rarely conflicts with anything, and does provide some speed increase in most machines)