| 摘要 |
<p>PURPOSE:To enable to start the program at restoration from power failure with a simple constitution, by using the computer for the discrimination for detection of the occurrence of power failure. CONSTITUTION:Commercial power supply is connected via the power switch 3 to the primary side of the power supply circuit 1 feeding DC voltage to the computer 2, the capacitor 4 of a large capacity is inserted to the secondary side of the circuit 1, and if the power supply is OFF, the voltage required to operate the computer 2 is held for a short time. Further, the power supply detection circuit 6 is connected to the primary of the circuit 1, the request signal of power failure by open switch 3 or power failure is fed to the input terminal i1 of the computer 2 and the detection signal of the switching condition for the switch 3 monitored with the auxiliary switch 5 is fed to the input terminal i2 of the computer 2. Further, the computer 2 checks the condition of the switch 3, power failure code is written in the non-volatile memory at power failure and the processing operation for restoration of power failure is made by reading out the power failure code in the memory at the restoration of power failure.</p> |
