Abstract: A grid interconnection device includes a relay controller configured to control separation or interconnection of a relay; a receiver configured to receive, from a predetermined transmission path, power failure information containing at least local area information indicating an area in which a power failure occurs; a determination unit configured to determine an occurrence of a power failure in a power distribution system, when the power failure information includes local area information of an area to which the power distribution system belongs; and a detector configured to detect an islanding state. The detector increases detection sensitivity of the islanding state when the determination unit determines the power failure in the power distribution system. The relay controller performs separation control for the relay when the islanding state is detected by the detector.

Abstract: A grid interconnection device includes a relay controller configured to control separation or interconnection of a relay; a receiver configured to receive, from a predetermined transmission path, power failure information containing at least local area information indicating an area in which a power failure occurs; a determination unit configured to determine an occurrence of a power failure in a power distribution system, when the power failure information includes local area information of an area to which the power distribution system belongs; and a detector configured to detect an islanding state. The detector increases detection sensitivity of the islanding state when the determination unit determines the power failure in the power distribution system. The relay controller performs separation control for the relay when the islanding state is detected by the detector.

Abstract: In a method of deciding robot layout according to the present invention, the origin (P.sub.i) of a robot layout is entered, the range (1) of robot motion at the origin of robot layout is displayed, obstacles (2, 3) within this range of motion are displayed in a color different from that of obstacles outside the range of robot motion, and the origin of robot layout is decided, while reference is made to the display, in such a manner that the robot will not interfere with the obstacles and will be capable of performing motions with respect to a workpiece.

Abstract: A correlation between numbers of input/output ports in a robot controller and F keys (F0-F15) provided on the off-line programming apparatus is preset and stored in a storage area (1c-2). In this state, off-line control is executed based on robot data stored in a storage area (1c-1). If input of a prescribed signal is being awaited, an F key corresponding to the port through which this signal is inputted is pressed to generate this signal artificially. As a result, since the conditions for executing the next command are satisfied, the next command is executed. If output of a prescribed signal is being awaited, an F key corresponding to the port through which this signal is outputted is pressed to generate this signal artificially. As a result, since the conditions for executing the next command are satisfied, the next command is executed.