| 摘要 |
at least three or more control switch units each installed in a main controller and higher and lower auxiliary controllers, for switching a power supply voltage received through the main controller and the higher auxiliary controller from a power supply voltage unit into an input/output relaying unit of the lower auxiliary controller; a signal line connected in common to an input terminal of a microprocessor of the main controller and the higher and lower auxiliary controllers; and at least three or more buffering units for buffering output signals from output terminals of the microprocessor of the main controller and the higher and lower auxiliary controllers and for transmitting the buffered signals via the signal line.
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