Through the 400PLC control of a WINCC status display, but in WICC do not see the connection variables of him and PLC, is indeed WICC internal variables seen in WICC, this is what he shows the status of the PLC through what way, is not through C script or VB script to achieve, how should the specific find?
WINCC comes with the tool which has a diagnosis channel tool, if WinCC and PLC communication is normal, then show green. Methods of operation: start – SIMATIC – WINCC – TOOLS – diagnosis channel
Reference: “PLC link WinCC, the same variable appear in different states”
“WinCC and PLC communication status display”