A plurality of robot arms (201, 211, 301, 311) are each provided with indication devices (205, 215) that have indicators (205B, 215B) which indicate operability states of at least one other robot arm different from the robot arm on which the indication device is provided. Alternatively or in addition, the indication devices (205, 215) have indicators (205A, 215A) which indicate operability states of a respective robot arm upon which the indication devices are provided. Robot control devices (202, 212) which control operations of the robot arms communicate through a LAN (230) to share information regarding the states of the robot arms. Indication drive signals for the indication devices (205, 215) are generated based on states of servo control signals and/or brake control signals for the robot arms.
ROBOT APPARATUS