What is fail safe state? Since safety critical systems do not have fail safe state, how is safety guaranteed?
A fail safe state of a system is one which if entered when the system fails, no damage would result. All traditional non real time systems do have one or more fail safe states.
However, safety critical systems do not have a fail safe state. A safety critical system is one whose failure can cause severe damages. This implies that the reliability requirement of a safety critical system is very high.