Hello! I have been finding this issue for a while with my 1500. I can get online with the TIA Portal, but not being able to switch to RUN mode. Any guesses
what is OB 121 ? Trouble Shooting Programming Errors with OB 121 ? || PLC Programming for Beginners - YouTube
Siemens – 6ES7315-2AH14-0AB0 - CT PRECISE
Which organization blocks do you need for error handling in STEP 7 V5.5? - ID: 11499205 - Industry Support Siemens