| 摘要 |
<p>PURPOSE:To improve the reliability with respect to external noises and momentary interruption by generating synchronous initializing signal in addition to a conventional power supply application and initializing command. CONSTITUTION:An automatic power supply controller 10 actuating a power supply circuit 15 of a central processor gives an inquiry signal to each I/O 6 to sense the power ON state. When a response exists, the controller 10 activates the power supply circuit 15 to turn on the power of the central proces sor. In this case, a communication line 5 with the I/O 6 is connected to the central processor from the controller 10 by a changeover switch to attain data transmission/reception. In this case, a generating circuit 11 of a periodical initial izing signal is provided in addition to the generating circuits 3, 4 for a forced initializing signal by the external command and for the initializing signal at application of power as the reset means of the controller 10 and the initializing signal is inputted in parallel with the OR circuit 2. Thus, a reset signal is given to the controller 10 at a prescribed period and the system inactivation due to the runaway of the controller 10 is prevented.</p> |
