Safety controller

Details Safety controller Safety controller

1982-09-10

1985-05-28

Atkinson, Charles E.

Excavating

364184, 371 25, G06F 1116

Patent

active

045204829

ABSTRACT:
A safety controller comprises a comparator and two identical subcontrollers operating on the same input signals. The comparator provides error detection by comparing the outputs of the two subcontrollers. Each subcontroller includes combinational devices and memory registers for providing exhaustive testing of the registers and of the truth tables of the combinational devices of each of the subcontrollers. Controllers of the present invention are particularly useful as railway safety devices.

REFERENCES:
patent: 3509532 (1970-04-01), Vande Wege
patent: 4096989 (1978-06-01), Tawfik
patent: 4096990 (1978-06-01), Strelow
patent: 4251873 (1981-02-01), Joby
patent: 4313199 (1982-01-01), Aichelmann, Jr. et al.
patent: 4363124 (1982-12-01), Aichelmann, Jr.
patent: 4435806 (1984-03-01), Segers et al.

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