Numerical control device having function of changing set parameter for controlling control object at certain timing, and method for changing set parameter therefor

A numerical control device having a function of changing a set parameter for controlling a control object at a predetermined timing, comprising:

• a main control unit that outputs various commands to the control object;
• a memory that stores various data including the set parameter;
• a parameter input unit that inputs a changed set parameter that is changed by overwriting the set parameter stored in the memory;
• and
• a parameter change command unit that outputs an update command for changing the set parameter into the changed set parameter, wherein
• the parameter change command unit comprises:
• a determination data selecting section that selects determination data for determining the predetermined timing based on the set parameter;
• a data acquiring section that acquires a detection value of the determination data in real time;
• and
• a determining section that creates the update command based on the detection value acquired by the data acquiring section.