Malfunction detection system for a programmable controller

Details Malfunction detection system for a programmable controller Malfunction detection system for a programmable controller

1977-03-21

1978-06-13

Morrison, Malcolm A.

Registers

Systems controlled by data bearing records

Time analysis

364900, G06F 100, G05B 1100

Patent

active

040950948

ABSTRACT:
A programmable controller includes a hardwired monitor module which connects to the I/O address decoder and the central logic unit of the controller. The monitor module detects malfunctions which cause deviations in the operation of these elements from a prescribed pattern, and in response generates a disabling signal which deenergizes all operating devices on the controlled system. A diagnostic module is also included and is comprised of a set of routines stored in the controller memory which periodically direct the controller to operate according to a prescribed pattern and to indicate deviations from that pattern as a malfunction. Such malfunctions are indicated in a diagnostic register which connects to the monitor module.

REFERENCES:
patent: 3686639 (1972-08-01), Fletcher et al.
patent: 3701113 (1972-10-01), Chace et al.
patent: 3810104 (1974-05-01), Markley
patent: 3829842 (1974-08-01), Langdon et al.
patent: 3969703 (1976-07-01), Kwiatkowski et al.

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