Numerical controller with function of automatically reconstructing settings and function of preventing incorrect settings

A numerical controller including a processor which controls a start-up based on a start-up setting for setting an operating environment, the numerical controller comprising:

• an incorrect-setting detection database for storing a setting value of a start-up setting that inhibits completion of a start-up of the numerical controller;
• a startable setting storage unit for storing a start-up setting which allows the numerical controller to be started;
• a start-up determination unit for determining whether a start-up of the numerical controller has been completed at a time of start-up of the numerical controller;
• a back-up unit for storing a current start-up setting in the startable setting storage unit as startable setting data if the start-up determination unit determines that the start-up has been completed;
• an incorrect setting registration unit for detecting, if the start-up determination unit has determined that the start-up has not been completed, a start-up setting that inhibits completion of a start-up and registering the detected start-up setting in the incorrect-setting detection database;
• a start-up setting reconstruction unit for reconstructing a current setting of the numerical controller to a startable setting based on the startable setting data stored in the startable setting storage unit;
• a restart unit for restarting the numerical controller;
• and
• an incorrect setting search unit for, when the start-up setting of the numerical controller has been changed, searching the incorrect-setting detection database based on the changed start-up setting, and, if the same start-up setting as the changed start-up setting is found, outputting the found start-up setting.