Abstract: A purging device configured to purge a container defining a periphery of a pressurized explosion-proof structure by supplying protective gas into the container is provided. A purge controlling module controls a flow rate adjusting device to supply the protective gas into the container to purge during a purging period including at least two main periods and at least one sub period. The main period and the sub period are set alternately on a time axis. A maximum supply flow rate per unit time during the sub period is at or below 10% of a maximum supply flow rate per unit time during the last main period, and at or below 10% of a maximum supply flow rate per unit time during the next main period.

Abstract: A plurality of robots each has a plurality of control modes including an automatic mode, a manual mode, and a corrected automatic mode in which the robot operates based on a task program while being sequentially corrected by the operator's manipulation. A first robot performs a first work to a work target in one of the corrected automatic mode and the manual mode, location data of the work target in a robot coordinate system of the first robot is acquired. Based on the location data of the work target in the robot coordinate system of the first robot and a relative relation between the robot coordinate system of the first robot and the robot coordinate system of the second robot, location data of the work target in a robot coordinate system of a second robot is corrected.

Abstract: An intrinsically safe explosion-proof compound cable includes a plurality of unit cables. Each of the unit cables is configured to transmit a signal or power. The plurality of unit cables include one or more shielded cables each having a shield layer and one or more unshielded cables without the shield layer. At least a highest-frequency unit cable that is the unit cable configured to transmit the signal or power at the highest frequency among the plurality of unit cables is the unshielded cable.

Abstract: An intrinsically safe compound cable of the present disclosure includes a plurality of unit cables to, each of the unit cables configured to transmit a signal or power. The plurality of unit cables include one or more shielded cables each having a shield layer and one or more unshielded cables without the shield layer. At least a highest-frequency unit cable that is the unit cable configured to transmit the signal or power at the highest frequency among the plurality of unit cables to is the unshielded cable.

Abstract: A plurality of robots each has a plurality of control modes including an automatic mode, a manual mode, and a corrected automatic mode in which the robot operates based on a task program while being sequentially corrected by the operator's manipulation. A first robot performs a first work to a work target in one of the corrected automatic mode and the manual mode, location data of the work target in a robot coordinate system of the first robot is acquired. Based on the location data of the work target in the robot coordinate system of the first robot and a relative relation between the robot coordinate system of the first robot and the robot coordinate system of the second robot, location data of the work target in a robot coordinate system of a second robot is corrected.