Applies To:
  • CitectSCADA 4.xx, 5.xx
Summary:
Citect runtime starts but cannot establish communications with a PLC. The only error is a hardware alarm, PLC is offline, cannot talk.

I have installed a card to talk to the PLC. After, the PC had been rebooted but still no communications. Citect was even reinstalled but still no communications could be established.

 

Solution:
Checking NT diagnostics reveals that the card is installed but the WinRT "device" is not appearing;

Administrative tools | Windows NT Diagnostics | resources | devices.

Also checking the Winnt\system32\drivers folder reveals that the "WinRT.sys" file was installed but further investigation shows that there are no settings for "WinRT" in the system registry. This indicates an O/S problem.

The solution is, after installation of a card and/or software, the relevant NT service pack needs to be reloaded. After this, Citect may need to be reinstalled to correctly install the WinRT device. The system should communicate correctly after a reboot.

 
Keywords:
 

Attachments