SIMATIC S7-300 in MODE RUN after POWER OFF.

[Rogertecn]

Hello.
I need your help to answer the questions:

When the Simatic S7-300 is operating normally, with the key in RUN mode, and there is a power failure CPU (POWER OFF).
When you return the power to the CPU (POWER ON)
What will be the status of the CPU?

It returns to RUN?
The CPU requires a RESET to return to RUN mode?
This behavior can be parameterized?
When there is remote racks communicating via PROFIBUS, the CPU behaves the same way?

I appreciate the support of this forum so helpful to us.

[Rogertecn]

nobody?

[CoMod]

F1: OB100
Diagnostic buffer