04095094 is referenced by 28 patents and cites 5 patents.

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.

Title
Malfunction detection system for a programmable controller
Application Number
434333
Publication Number
4095094
Application Date
March 21, 1977
Publication Date
June 13, 1978
Inventor
Ernest F John
Willoughby
OH, US
William W Searcy
Richmond Heights
OH, US
Odo J Struger
Chagrin Falls
OH, US
Agent
Quarles & Brady
Assignee
Allen Bradley Company
WI, US
IPC
G05B 11/00
G06F 1/00
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