Numerical control system

A numerical control system, comprising:

• a numerical control device that controls an operation of a machine tool, based on a numerical control program;
• and
• a robot control device that controls an operation of a robot, based on a robot command,
• wherein the numerical control device includes one or more control modules that generate the robot command, based on the numerical control program,
• wherein the control modules each include:
• a robot command generation unit that generates the robot command, based on the numerical control program;
• a robot connection request unit that generates a connection request to the robot control device;
• and
• a command-transmitting communication interface that transmits the connection request and the robot command to the robot control device,
• wherein the robot control device includes:
• a command-receiving communication interface that receives the connection request and the robot command;
• a robot operation control unit that controls the operation of the robot, based on the robot command;
• and
• a robot connection response unit that generates a connection approval for the connection request after the connection request is received by the command-receiving communication interface,
• wherein the command-receiving communication interface transmits the connection approval to the command-transmitting communication interface, and
• wherein the command-transmitting communication interface starts transmission of the robot command to the command-receiving communication interface after receiving the connection approval.