A robot system includes a conveying device, a robot, a control unit for controlling operation of the robot by transmitting a drive signal to a motor of the robot, and for outputting a driving speed control signal to the conveying device, and an encoder for detecting a conveying speed of the conveying device in a regular operation mode, where, when the robot is to be operated in a teach mode and a test mode, the control unit transmits a drive signal to the robot such that an operation speed is reduced by a received override value, and outputs the driving speed control signal such that the conveying speed of the conveying device is reduced by the override value.