Dear jotey,

if run/stop led is flashing yellow, the cpu is loading the user program from the simatic memory card (and other states, please find link below). Maybe the simatic memory card is damaged and the program could not be loaded.
Do you have another SMC to try/test?

Status and error display of the CPU

regards

sancruz

Dear Jotey

I am facing the same issue in one of my redundant CPU 1517H. Can you guide me how did you resolve this issue?

there is a major problem in the redundant network because of this issue. looking forward to your support

jotey

Help needed here, Upon power on, this S7 1516 CPU it hangs on CONNECTING status continuously, and the Run/Stop LED is blinking orange continuously, it cannot read what's inside the overview, diagnostics, setting, module,  but it can read what's inside the display menu.... here's a photo of it..

Photo missing.  Perhaps you can post a screenshot of the TIA Portal devices and networks for the entire project to see how the redundant network is configured in hardware?

Are you able to remove the s7-1516 from your redundant profinet network so you can attempt to connect to it directly using your PG/PC?

seeker1

Dear Jotey

I am facing the same issue in one of my redundant CPU 1517H. Can you guide me how did you resolve this issue?

there is a major problem in the redundant network because of this issue. looking forward to your support

jotey

Help needed here, Upon power on, this S7 1516 CPU it hangs on CONNECTING status continuously, and the Run/Stop LED is blinking orange continuously, it cannot read what's inside the overview, diagnostics, setting, module,  but it can read what's inside the display menu.... here's a photo of it..