A fault diagnostic device comprises an arithmetic processing device configured to judge a fault on the basis of an image captured by the camera. The arithmetic processing device includes an imaging command part configured to transmit a command for capturing the image of a diagnosis portion and a judgement part configured to judge whether or not the diagnosis portion has the fault. A storage part stores a reference image when the diagnosis portion is in a normal state. The imaging command part transmits an imaging command so as to capture the image of the diagnosis portion after changing a position and a posture of the robot. The judgement part compares the image of the diagnosis portion captured by the camera with the reference image and judges the fault in the diagnosis portion.

Provided is a history management device for managing history information pertaining to the results of execution of a prescribed process by an industrial machine, the history management device comprising a display unit and a history display control unit that controls the display of history information on the display unit. The history display control unit reads history information from both a first storage unit that stores history information and a second storage unit that stores history information and has a property differing from that of the first storage unit, and the history display control unit simultaneously displays the history information on the display unit.

A fault diagnostic device comprises an arithmetic processing device configured to judge a fault on the basis of an image captured by the camera. The arithmetic processing device includes an imaging command part configured to transmit a command for capturing the image of a diagnosis portion and a judgement part configured to judge whether or not the diagnosis portion has the fault. A storage part stores a reference image when the diagnosis portion is in a normal state. The imaging command part transmits an imaging command so as to capture the image of the diagnosis portion after changing a position and a posture of the robot. The judgement part compares the image of the diagnosis portion captured by the camera with the reference image and judges the fault in the diagnosis portion.

A robot system, includes: a robot; a camera configured to capture an image of operation of the robot; and a circuit configured to: control the robot so as to perform work in accordance with work contents information preliminarily stored to indicate a series of work contents; save image information captured by the camera during work performance by the robot in association with time information; and display the saved image information together with the time information.