| 摘要 |
PROBLEM TO BE SOLVED: To transmit latest information related to an abnormal state from a wireless communication device after starting an automated guided vehicle. SOLUTION: The automated guided vehicle transmits an abnormality signal S1 to a ground controller by abnormality occurrence, and stops. The ground controller stores the abnormal state of the automated guided vehicle, and transmits an abnormality instruction S2 to a worker. Though a normality signal S3 is input to the automated guided vehicle when the worker turns on power after abnormality repair, the automated guided vehicle transmits an abnormality signal S4 that is an inverted signal to the ground controller during a monitoring time. Because the ground controller has already stored the abnormal state, the ground controller continues it. After the monitoring time lapses, the automated guided vehicle receives the normality signal S3 to stop the transmission of the abnormality signal. The ground controller recognizes a normal state at a falling edge of a transmission signal from the automated guided vehicle, and resets the storage of the abnormal state. Accordingly, the latest information related to abnormality of the automated guided vehicle can be transmitted to the ground controller, so that accordance between an actual state of the automated guided vehicle and the recognition of the ground controller can be automatically performed in an early stage. COPYRIGHT: (C)2009,JPO&INPIT
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