I would like to make a simple ON/OFF button using Wincc Flexible 2008 in order to turn ON/OFF a digital output of my PLC. It will be excellent if someone could help me with a exemple. I've tried for many times unfortunately without results, because I always get the error "No connection for PLC...The symbol is disabled for WinCC flexible or it exceeds the 64 Kb limit for a source!" The connection is ok, I use a MPI/DP device to connect my laptop to PLC.

Thanks in advance.

Thanks.

It seams that the problem is my PLC that have S7-314 CPU, and in this case I can communicate between my laptop and PLC only with step7 but never by means of WinCC.

Thanks for support.