Excavating
Patent
1985-06-14
1987-04-07
Atkinson, Charles E.
Excavating
371 1, 371 8, G06F 1120
Patent
active
046566341
ABSTRACT:
This invention relates to a fault detect and signal routing device that may be used to monitor and control redundant signals. The invention includes an input/output unit (11) for receiving the redundant signals and an output for outputting one of the signals. The input/output unit (11) also provides logic signals that relate to the received signals. A fault inhibit unit (12) receives the logic signals and provides outputs that relate thereto to a time delay unit (13), a fault detect unit (14), and a signal route control unit (16). The fault detect unit (14) serves to compare signals from the time delay unit (13) and the fault inhibit unit (12) to determine if certain kinds of signal faults have occurred. If one has, the fault detect unit (14) provides fault signal. The signal route control unit (16) receives the input signals and the signals from the fault inhibit unit (12) and provides a control signal to the input/output unit (11) to control which input signal is provided to the output.
REFERENCES:
patent: 3927392 (1975-12-01), Caron
patent: 4032757 (1977-06-01), Eccles
patent: 4122995 (1978-10-01), Franke
patent: 4234956 (1980-11-01), Adderley et al.
patent: 4354270 (1982-10-01), Nuding
patent: 4477895 (1984-10-01), Casper et al.
patent: 4542505 (1985-09-01), Binoeder et al.
Lombardi Steven A.
Potter David O.
Atkinson Charles E.
Motorola Inc.
Parmelee Steven G.
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