Numerical control system

A numerical control system comprising:

• a numerical control device configured to generate a machine tool command signal as a command directed to a machine tool in accordance with a first numerical control program, and a robot command signal as a command directed to a robot in accordance with a second numerical control program;
• and
• a robot control device communicable with the numerical control device and configured to control operation of the robot based on the robot command signal, wherein
• in the second numerical control program, a position and a posture of the robot is able to be specified in two or more coordinate formats having different control axes,
• the numerical control device includes a processor configured to execute instructions to implement a coordinates-configuration information management unit, a robot command signal generation unit, a coordinates-configuration information control unit, and a data transmission/reception unit, the coordinates-configuration information management unit being configured to manage coordinate information including, as components, coordinate values of control axes of a designated coordinate format that is designated in accordance with the second numerical control program, the robot command signal generation unit being configured to generate the robot command signal based on the coordinate information managed by the coordinates-configuration information management unit and based on the second numerical control program, the coordinates-configuration information control unit being configured to generate a request signal to acquire coordinate values of the control axes in the designated coordinate format upon setting or switching of the designated coordinate format, and the data transmission/reception unit being configured to transmit the request signal to the robot control device,
• in response to receiving the request signal, the robot control device acquires the coordinate values of the control axes in the designated coordinate format after the setting or the switching, and transmits the acquired coordinate values to the numerical control device, and
• the coordinates-configuration information management unit updates the coordinate information according to the coordinate values transmitted from the robot control device.