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Microprocessor Implemented Noise Diagnostics

IP.com Disclosure Number: IPCOM000088801D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Waddell, JM: AUTHOR

Abstract

A machine having electromechanical devices (EMD) of the cyclical type has a tachometer (T), indicating rotational position of rotating parts within the machine. Such tachometer has an index and a tach output, the index indicating a fiducial position of the tachometer. Actuation and deactivation of the EMDs via microprocessor control can generate noise signals within the machine which interfere with the sensing of the tachometer and index pulses. The microprocessor includes a microprogram for verifying lack of such interference.

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Microprocessor Implemented Noise Diagnostics

A machine having electromechanical devices (EMD) of the cyclical type has a tachometer (T), indicating rotational position of rotating parts within the machine. Such tachometer has an index and a tach output, the index indicating a fiducial position of the tachometer. Actuation and deactivation of the EMDs via microprocessor control can generate noise signals within the machine which interfere with the sensing of the tachometer and index pulses. The microprocessor includes a microprogram for verifying lack of such interference.

The program is entered with the number of checking cycles being predetermined and counted during execution of the diagnostic. At the same time the tachometer pulses are counted. If no error is detected upon the completion of the number of microprocessor cycles, an error-free exit is taken to another program (not discussed).

Each diagnostic or test cycle includes sensing for the index pulse. In the absence of an index pulse the program proceeds to a table, indicating whether or not it is time for having received an index pulse. If no index pulse is received, error exit 1 is taken, with a missing index pulse indicated in an error log (not shown). However, if it is not time for index, the microprogram actuates the microprocessor to actuate a selected EMD. The EMDs may be selected in a predetermined sequence or selected in accordance with a random number generator over a predetermined number of cycl...