This term denotes an estimate of the time left before the hazard is likely to materialize.
In any moment during the operation, the system can estimate the time remaining until exiting the safety range. This information is extremely important for deciding on transit to safety mode operation.
The grace time is significant for the operators, to decide which action they can complete in time.
The critical time is the time after which the operator may not be able to solve the problem. In the time after the critical time, the system is under threat. It is the machine's turn to mitigate the risks of the threat.
Updated on 20 Dec 2016.