Hey all, I have successfully had Citect and CBus communicating in both directions using OPC, when my computer was connected to the CBus network via a PCI. Using the same configuration settings in Citect, I can only achieve 1 way communication with CBus from Citect when connected over a CNI. I remember I did have this problem in the previous (PCI) set up, for a while, but then it resolved itself without any specific alterations being made. Citect is able to write to CBus and change values, however Citect does not respond when values are changed in CBus (using the 'CBus side' OPC client to change values) and constantly displays a #COM error. Has anyone had a similar issue and managed to resolve it? Kindest Regards, Adam [IMG]http://www.iii.uk.net/Sketchbook/CBus/images/Cbus_OPC_Citect.jpg[/IMG]