| 摘要 |
<p>PURPOSE:To shorten a communication interrupting time by restricting program down loading from a master node to a slave node to an irreducible minimum at the time of turning on/off a power supply for the slave node. CONSTITUTION:The master node 100 stores programs for respective slave nodes on its floppy disk 101. When a down loading request is outputted from a slave node 200, a control part 103 reads out the program from the floppy disk 101 and sends the read program to the slave node 200. In the slave node 200, a down loading program is stored in a memory part 204. Normally a power supply control part 205 connects a power supply part 208 to the memory part 204, and when the power supply part 208 is turned off, connects a battery 209 to the memory part 204. When the power supply part 208 is turned on again, a control part 202 checks the normality of the program in the memory part 204, and only at the time of abnormality, outputs a down loading request to the master node 100.</p> |
