| 摘要 |
<p>PURPOSE: To prevent the information from malfunctioning owing to the inserting/ extracting operation of a board even when the board mounted with a CPU is extracted. CONSTITUTION: A start signal indicating the start of the hot-line inserting/ extracting operation of the board including a CPU circuit 1 that is constituted detachably and sends and receives signals to and from other circuits and an end signal indicating the end of the operation are outputted from an input circuit 2 in response to manual operation. In response to the start signal, state information showing the state of the processor is held in a nonvolatile memory 3. In response to the end signal, the restoration processing of the processor is performed corresponding to the held contents. The start and end of the hot- line inserting/extracting operation of the board are indicated and other boards are not controlled during the period to prevent malfunction in the inserting/ extracting operation.</p> |
