Robot system

A robot system comprising:

• a plurality of robot arms having a motor;
• a plurality of controllers controlling the robot arms;
• and
• a teaching device designating the controller and transmitting an instruction signal thereto, wherein
• the controller includes:
• a control unit controlling an operation of the robot arm;
• a motor operation control unit controlling whether to operate the motor or not;
• a connector for coupling a wiring electrically coupling to the teaching device;
• and
• a switch unit setting whether to operate the motor or not,
• the motor operation control unit controls the operation of the motor, based on the setting by the switch unit about whether to operate the motor or not, regardless of the instruction signal,
• wherein the wiring comprises a first wiring, a second wiring and a third wiring;
• the controller is electrically connected to the teaching device via the first wiring, the second wiring and the third wiring;
• the switch unit is electrically connected to the first wiring and the second wiring;
• and the control unit communicates with the teaching device via the third wiring to receive the instruction signal so as to control the operation of the robot arms.