Boots – shoes – and leggings
Patent
1977-04-25
1978-10-03
Chapnick, Melvin B.
Boots, shoes, and leggings
364104, 364119, 235304, G06F 906, G06F 1100
Patent
active
041187920
ABSTRACT:
Fault detection hardware is employed at the I/O interface racks of a programmable controller to detect fault conditions which may occur there. An I/O fault line is connected in daisy chain fashion between the I/O interface racks and the controller processor, and when a fault is indicated at any of the I/O interface racks, it is communicated to the controller processor through this line. The indicated I/O fault freezes, or holds, a microprocessor in the controller processor, and if the I/O fault persists for a preselected time interval, all operating devices connected to the programmable controller interface racks are decontrolled. A watchdog timer is also provided in the controller processor for detecting malfunction conditions which may occur at the processor. When such a condition is detected, the operating devices connected to the programmable controller interface racks are decontrolled.
REFERENCES:
patent: 3719931 (1973-03-01), Schroeder
patent: 3829842 (1974-08-01), Langdon et al.
patent: 3944984 (1976-03-01), Morley et al.
patent: 3997879 (1976-12-01), Markley et al.
Andreiev, "Programmable Logic Controllers" in Control Engineering, Sep. 1972, pp. 45-47.
Symmes, "Programmable Controllers and Computers Complement Each Other for More Effective Industrial Control" in Computer Design, Sep. 1973, pp. 54, 56, 58, 60.
Kompass, "Multiprocessor Concept Leads to PLC Hierarchies" in Control Engineering, Jan. 1976, pp. 46-47.
Dummermuth Ernst
McAdams Timothy E.
Struger Odo J.
Allen-Bradley Company
Chapnick Melvin B.
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