| 摘要 |
A disconnection detecting portion detects a disconnection of a power supply bus. A connecting portion connects both ends of the power supply bus when the disconnection is detected by the disconnection detecting portion. Also, a first power supplying portion is connected to one end side of the power supply bus and connected to the equipments via the power supply bus. A second power supplying portion is connected to the other end side of the power supply bus and connected to the equipments via the power supply bus. Another disconnection detecting portion detects the disconnection a communication bus. A controlling portion causes the first power supplying portion and the second power supplying portion to function when the disconnection is detected by the disconnection detecting portion.
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