Production system for performing cooperative work by operator and robot

A production system comprising:

• a robot,
• a controller that controls the robot;
• a person detection part that detects whether or not an operator has entered to a cooperative operation space where the robot and the operator are supposed to enter at the same time in order to work in cooperation,
• a speed detection part that detects a speed of the robot, and
• an external-force detection part that detects an external force applied to the robot, wherein
• the controller includes:
• a power cutoff unit that cuts off power supplied to the robot;
• a reference-speed storage unit that stores a predetermined reference speed;
• a reference-force storage unit that stores a predetermined reference force;
• first speed comparison unit that compares a current speed of the robot and the predetermined reference speed stored in the reference-speed storage unit, the current speed being detected by the speed detection part, the first speed comparison unit having a function of activating the power cutoff unit so as to stop an operation of the robot when the current speed exceeds the predetermined reference speed;
• and
• an external-force comparison unit that compares a current external force applied to the robot and the predetermined reference force stored in the reference-force storage unit, the current external force being detected by the external-force detection part, the external-force comparison unit having a function of activating the power cutoff unit so as to stop an operation of the robot when the current force exceeds the predetermined reference force, and
• the controller is configured to disable functions of the first speed comparison unit and the external-force comparison unit while the person detection part detects absence of the operator in the cooperative operation space.