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Preventative maintenance and diagonstic system

  • US 5,754,451 A
  • Filed: 02/29/1996
  • Issued: 05/19/1998
  • Est. Priority Date: 02/29/1996
  • Status: Expired due to Term
First Claim
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1. A maintenance system for a machine controlled by a programmable logic controller, the programmable logic controller including a memory which stores input data received from the machine and output data communicated to the machine, the maintenance system comprising:

  • a computer interfaced to the memory and prohibited from modifying the memory, the computer operative to monitor a state of the machine over a plurality of manufacturing cycles, the state including at least a portion of the input data and the output data, the computer further operative to detect a fault condition for a component of the machine based upon a comparison of a current state for the manufacturing cycle and a previous state for the manufacturing cycle; and

    a display device in communication with the computer to alert an operator of the fault condition and to graphically display a location of the component within the machine to facilitate a corrective measure by the operator.

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