Hello AutoGen_5902644

If your HMI project has the same TIA Version or has a newer TIA Version than the PLC Projects you can use inter project engineering for integrating them as a proxy device:

https://support.industry.siemens.com/cs/ww/en/view/109815056/162398230155

Which this you can "link" your PLC from another TIA project to the HMI Project for an "integrated" communication.

Bye Murof

AutoGen_5902644

Hi expert,

I searched "proxy" but i don't want to use it, i mean i can connect WinCC and PLC (same version TIA V17) via Connection (S7Online) without using proxy. I don't know what is the mistake here.

 Hello AutoGen_5902644

yes you can do a manual HMI Connection but then you cannot use optimized DBs in the PLC for HMI communication. You would need to do absolute addressing. Symbolic addressing is only possible if you have the PLC in the same project or connected with a proxy device and using an integrated connection.

bye Murof

Hi,

ups, didn't see that there were already replies.

Regards,

Frink