Hello i'm loocking for som kind of signal that i could refer to a HMI when the G120 is online/Offline.

It is conected to a s7 - 1200.

Thanks.

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Split from Connection Error is between S7-1200 to G120C via PN.

Hi, 

There is multiple ways to diagnose HW elements. It is really depends on what do you need. 

Some example:

System Diagnostics with S7-1500 and TIA Portal

System Diagnostics View using WinCC (TIA Portal) and SIMATIC Comfort Panels

In STEP 7 (TIA Portal), how can you read out diagnostics data of a hardware object with the GET_DIAG instruction?

Also there is a way to connect the HMI to the drive directly to drive(the example is for WINCCFLEX):

How do you establish a direct connection between HMI Panels and frequency converters (SINAMICS and Micromaster)?

Cheers