Hi,

there is a Serious firmware exceptionan and the PLC went to stop mode.

You still have Firmware 2.2.0. - it´s the highest version for this PLC.

Ask Siemens, perhaps the can tell you something about this Event ID with internal system code.

Regards,

Towome

Once you contact Siemens, please post back what they suggest.

My guess is that the PLC is too close to 400/480VAC and is picking up EMI so strong that it sometimes modifies memory in the PLC, which is a reason for a PLC to go into fault.

HPINA

I have a problem with these cpus, we have the same program in about 5 cpus and there are a couple that suddenly go to stop, we do not know why this happens, any idea? I leave the diagnosis attached,

Thanks

Mohsen0742

It is recommended to update to the latest firmware version. Should the issue persist after completing the firmware update and verifying the hardware, it is advisable to perform a factory reset of the CPU.

Your response reads like an AI generated answer. It does not match the problem statement and it is published far too late to have influence. 

Your effort may be well intended but unfortunately reminds of people who generates spam on this forum. I hope to see you make a positive contribution in the future.