Hello Atef;

The error message says you have an Inconsistent Safety program, which generally means that, since you are working with a F-CPU,  there were changes in the safety program that were not properly accepted and compiled before a download.

See what the Simatic Safety - Configuring and Programming manual has to suggest:

https://support.industry.siemens.com/cs/ww/en/view/54110126/129968969611

Hope this helps,

Daniel Chartier

hi Atef13,

Have you done anything before the SF became lit?

Or does anything else happen to the CPU before?

regards,