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Remote monitoring system state machine and method

  • US 4,622,538 A
  • Filed: 07/18/1984
  • Issued: 11/11/1986
  • Est. Priority Date: 07/18/1984
  • Status: Expired due to Term
First Claim
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1. Apparatus for evaluating the performance of at least one operating system which normally operates sequentially from state-to-state in a closed loop sequential chain of linked normal operating states, said apparatus minitoring the states of a plurality of two-state parameter signals provided by each monitored system, each parameter signal representative of a different one of a like plurality of operating system parameters, said apparatus providing periodic performance message signals indicative of the various possible operating conditions of each monitored system including inoperative conditions indicative of system degradation, said apparatus also providing immediate alarm message signals indicative of system failures requiring immediate corrective action, comprising:

  • signal processor means, responsive to said two-state parameter signals from each monitored system, and having means for storing signals including said two-state parameter signals, and having means for comparing the states of parameter signals selected according to the present operating condition of each monitored system with stored signals indicative of transitions from said present operating condition to a subsequent operating condition, said comparing means detecting transitions from said present operating condition to an inoperative condition, to an operative condition and to an alarm condition, and for providing transition signals indicative thereof, said signal processor having means for counting transition signals indicative of transitions between particular normal operating conditions of each monitored system, for counting transition signals indicative of transitions between particular normal operating conditions and particular inoperative conditions, said signal processor having means for periodically providing performance message signals indicative of the count of detected transitions for each monitored system, said signal processor also having means for providing immediate alarm message signals for each monitored system indicative of detected transitions from inoperative conditions to alarm conditions; and

    display means, responsive to said alarm message signals for displaying alarm messages corresponding to each alarm condition detected in each monitored system, and responsive to said performance message signals for displaying performance messages corresponding to the count of said detected transitions in each monitored system.

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