Method to ensure safety critical functionality for an electrically powered machine

A laser engraver device, comprising:

• one or more sensors, each configured to sense an operating status of a respective component of the laser engraver device;
• a laser;
• a laser motor controller for controlling maneuvers of the laser for performing a job;
• a first power source that includes a laser power switch and that is configured to supply power to the laser depending on a state of the switch;
• a safety critical microcontroller;
• and
• a second power source for supplying power to the first power source, the laser motor controller, and the safety critical microcontroller;
• wherein:
• all hardware of the laser motor controller is separate from all of hardware of the safety critical microcontroller;
• and
• the safety critical microcontroller is configured to:
• obtain a command from the laser motor controller;
• for each of the one or more sensors:
• obtain the operating status of the respective component to which the respective sensor corresponds;
• and
• determine whether the respective operating status satisfies a predefined condition;
• and
• responsive to the determination for all of the one or more sensors being that the respective operating status satisfies the predefined condition, transmit a power-on command to the laser power switch to initiate flow of power from the first power source to the laser;
• as a result of obtaining the command from the laser motor controller, transmit a request for a start button of the laser engraver to be activated two times in succession, wherein the request is displayed to a user on a display device of the laser engraver;
• and
• receive from the start button a confirmation signal indicating that the start button has been activated two times in succession.