Malfunction detection system for a programmable controller

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

G - Physics

06

F

354/225.1

G06F 11/22 (2006.01) G05B 19/05 (2006.01) G06F 11/10 (2006.01) G06F 11/277 (2006.01)

Patent

CA 1042110

MALFUNCTION DETECTION SYSTEM FOR A PROGRAMMABLE CONTROLLER Abstract of the Disclosure 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.

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