Apparatus controlled by a microprocessor

Details Apparatus controlled by a microprocessor Apparatus controlled by a microprocessor

1979-10-19

1981-12-01

Smith, Jerry

Excavating

364119, G01R 3128, G06F 1100

Patent

active

043040039

ABSTRACT:
A control circuit using a microprocessor comprises a time counting circuit; a main control logic circuit receiving a time signal from the time counting circuit; and an AC signal generator receiving a first signal from the time counting circuit and a second signal from the main control logic circuit. When the microprocessor is out of order, the AC signal takes continuous "1" or "0" level. The control circuit further comprises a detecting circuit for detecting an abnormal state of the AC signal and a control circuit for maintaining an apparatus to be controlled by the control circuit in a predetermined safe state when the detecting circuit detects the abnormal state of the AC signal.

REFERENCES:
patent: 3598975 (1971-08-01), Miller
patent: 3795800 (1974-03-01), Nimmo
patent: 3890494 (1975-06-01), Meshek et al.
patent: 3919533 (1975-11-01), Einolf, Jr. et al.
patent: 4160155 (1979-07-01), Steele et al.

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