| 摘要 |
<p>PURPOSE:To facilitate the hot line maintenance operation of a subsystem as to the subsystem power source control unit by setting other subsystems in a self-holding state with a maintenance signal at the time of the maintenance of the subsystem. CONSTITUTION:The subsystems are connected in series sequentially from a host 2 and while the respective subsystems 1 are powered on in order in response to the transmission of a power-ON signal from the host 2, all other subsystems 1 hold their power-ON state by themselves in response to the transmission of a maintenance-ON signal from one subsystem 1 to the subsystems 1 in the precedent states and the subsystems in the trailing stages. After the maintenance of the power source of the subsystem 1, all other subsystems 1 release the self-holding of the power-ON states in response to the transmission of a maintenance-OFF signal from the subsystem 1 to the subsystems in the precedent and trailing stages.</p> |
