Robot controller which records state of occurrence of emergency stop of robot

A robot controller for controlling a robot, the robot controller comprising:

• a load detection unit which detects a load of a motor for driving each individual articulated axis of the robot;
• a speed detection unit which detects an axial speed at each individual articulated axis of the robot;
• a cause-of-stop identifying unit which, when an emergency stop of the robot occurs, identifies a cause of the occurrence of the emergency stop;
• a recording unit which records the cause of the occurrence of the emergency stop by associating the cause with the axial speed or the load of the motor;
• and
• a display unit which displays information representing a state of occurrence of the emergency stop of the robot,
• wherein the display unit is configured to display a number of occurrences of the emergency stop together with at least one of
• each predetermined axial speed range among a plurality of predetermined axial speed ranges of the axial speed, said each predetermined axial speed range corresponding to the number of occurrences of the emergency stop, or
• each predetermined motor load range of the load of the motor, said each predetermined motor load range corresponding to the number of occurrences of the emergency stop.