plc in error

Hi,

it seems like your connection between the PG/PC and the PLC was not stable, was interrupted or overloaded or corresponding response times have been exceeded and TIA did not receive a response from the PLC.
You could check whether your network cable is damaged or loose or maybe you are connecting over an unstable WLAN.

If you can't find any faults with your connection you could also try loading the project with a memory card:

Download project data into the S7-1200/S7-1500 CPU without TIA Portal