Restart, Hot Restart: Restart after power failure which occurs within the process dependent maximum time allowed for the PES to recover as if there had been no power failure. All I/O-information and other dynamic data as well as the Application Program context are restored or unchanged. Restart capability requires a separately powered real time clock or timer to determine elapsed time since the power failure was detected and a user accessible means to program the process dependent maximum time allowed. (Source: www.aiche.org/ccps/)
