Applies To:
  • CitectSCADA 6.xx, 7.xx
  • Vijeo Citect 6.xx, 7.xx

I have configured a Disk I/O Device but when I run my project all tags associated with this device display #COM. What steps can I take to rectify this problem?

1. Make sure that the Address field in the I/O Device form is valid and that the Windows user that is launching the Citect runtime has full read/write privileges to that location
2. Run the Computer Setup Wizard and make sure that the correct project is selected and that the computer role is set to 'Server and Display Client' (or 'Server and Control Client in v7.10 and above).
3. If the above steps do not help, the Disk I/O Device storage file may have been corrupted. Usually, this will result in a file with a 0Kb size. You will need shutdown the Citect runtime, delete the existing file and then restart the Citect runtime so that a new one is created. To locate the Disk I/O Device storage file, refer to the Address file in the I/O Devices form for the path. For example, if the address field shows [RUN]:IODev.CDK then you need to delete the IODev.CDK file located in the main project directory (refer to [CtEdit]Run parameter in citect.ini file for full location).