配置工程当 ATWS 进入到预设防状态，启动预设防定时器，定时时间 ATWS_PREARM_DURATION 到，将进入设防状态。(config When the ATWS enters the prearmed state, a prearm timer starts with ATWS_PREARM_DURATION time. When the prearm timer is expired, ATWS shall enter the armed state.)