Robot system

A robot system comprising:

• a robot controller;
• and
• a target robot as a target of control by the robot controller,
• wherein the target robot comprises plural drive shafts, each of the plural drive shafts comprises:
• a motor;
• an encoder that detects a rotary position of the motor;
• and
• a first memory unit provided in the encoder structured to store device specific data comprising:
• individual identification data used to identify said target robot;
• and
• an individual difference parameter unique to the encoder, wherein the robot controller comprises:
• a second memory unit structured to store the individual identification data and the individual difference parameter provided in the encoder of each of the plural drive shafts of the target robot connected to said robot controller;
• and
• a control unit structured to control the target robot on the basis of model configuration information common to a same model as the target robot and the individual difference parameter stored in the second memory unit, and
• wherein the control unit is structured to check the individual identification data and the individual difference parameter read from the first memory unit provided in the encoder of each of the plural drive shafts against the individual identification data and the individual difference parameter stored in the second memory unit and, in accordance with a checking result, update the individual difference parameter stored in the second memory unit with the individual difference parameter read from the first memory unit in a case that the individual difference parameter stored in the second memory unit does not match the individual difference parameter read from the first memory unit provided in the encoder of each of the plural drive shafts.