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Distributed logic control system and method

  • US 5,157,595 A
  • Filed: 03/08/1991
  • Issued: 10/20/1992
  • Est. Priority Date: 07/19/1985
  • Status: Expired due to Fees
First Claim
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1. A machine control system which comprises, in combination, at least one mechanism including means for actuating said mechanism, means for sensing mechanism conditions, and control means responsive to a predefined input from said condition-sensing means for providing a predefined output to said actuating means, characterized in that said control means comprises:

  • a present zone memory means for storing a present zone of a mechanism of said machine;

    an input/output image memory means for storing a table of input/output images associated with said present zone of said mechanism;

    an allowed next zones memory means for storing at least one allowed next zone associated with said present zone of said mechanism, at least one of said zones having a plurality of allowed next zones;

    means for comparing a new input/output image to an input/output image of said plurality of allowed next zones, wherein if said next zone corresponding to said new input/output image does not correspond to one of said plurality of allowed next zones, an error in processing of said machine exists, anda part processing inhibit table indicative of conditions wherein an operation on a workpiece at said mechanism should be inhibited because said workpiece is not properly prepared for said operation.

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