Emergency circuit for, e.g., numerical control unit

Details Emergency circuit for, e.g., numerical control unit Emergency circuit for, e.g., numerical control unit

1991-01-23

1994-03-22

Beausoliel, Jr., Robert W.

Excavating

371 151, G06F 1100

Patent

active

052971490

ABSTRACT:
A fault detection/alarm system includes an oscillator at one end of a signal cable whose clock output is OR'ed with a fault detection signal. A receiving unit receives the OR'ed signal and detects the leading edge of the clock. If the clock signal disappears due to breakage of the signal cable, the appearance of a fault detection signal or other reason, the leading edges are no longer detected, causing the raising of a fault signal which may be an emergency stop signal for the receiving unit.

REFERENCES:
patent: 4435698 (1984-03-01), Klett
patent: 4521884 (1985-06-01), Dix et al.
patent: 4616335 (1986-10-01), Howe, Jr. et al.
patent: 4795921 (1989-01-01), Kato
patent: 4916697 (1990-04-01), Roche et al.

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