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US 4,072,852 AGranted
Digital computer monitoring and restart circuit
AssigneeHoneywell Inc.
InventorsJames A. Hogan, Morton Sklaroff
Life of this patent
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AssigneeHoneywell Inc.
InventorsJames A. Hogan, Morton Sklaroff
Estimating the term…
A digital computer monitoring and restart circuit monitors the presence of periodic output signals from the digital computer by a missing pulse detector. When the detector senses a missing output signal from the computer, it indicates this detection operation by an output signal representation of the fact that the computer is not operating. In response to this output signal a restart pulse is generated by a restart pulse generator and is applied to the computer to restart the computer and to reset the monitoring circuit. Concurrently, a 5-second timer circuit is started. While the timer circuit is operating over its 5-second interval, if the monitoring circuit produces another output signal indicating that the computer is not operating, the 5-second timer is stopped and another restart operation is not attempted. If the 5-second timer is allowed to run to the end of the 5-second interval without the detection of a computer outage, the monitoring and restart circuit is reset by the 5-second timer to an initial state indicative of the continuing operation of the computer while awaiting a subsequent computer outage.
A method of monitoring the operation of a digital computer comprising the steps of detecting the presence of periodic output signals from the digital computer generated in response to a computer program, generating a restart signal if a predetermined number of said output signals is missing, applying the restart signal to the digital computer to restart the operation thereof, concurrently starting a predetermined time interval measurement to generate a control signal at the end of said time interval, detecting the presence of said output signals from the computer following the application of said restart signal to the digital computer and interrupting said measurement of said time interval to inhibit the generation of said control signal as an indication of a continued improper computer operation upon the detection of further missing ones of said output signals from the digital computer.
A digital computer monitoring and restart circuit comprising,
Dependencies are inferred from the claim text.