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Method of displaying an operation history of a machine

  • US 5,323,325 A
  • Filed: 03/18/1991
  • Issued: 06/21/1994
  • Est. Priority Date: 07/20/1989
  • Status: Expired due to Term
First Claim
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1. A method of displaying an operation history of a numerically controlled machine during control by a numerical control unit, comprising the steps of:

  • (a) successively storing, in address regions of a memory, block information indicative of each block in a numerically controlled machining program, the numerically controlled machining program composed of a series of the blocks to be read block by block;

    (b) successively detecting state information identifying circuit sections of an input/output circuit concerned in control information transfer between the numerically controlled machine and the numerical control unit during execution of each block and discriminating those circuit sections to have been concerned in the control information transfer;

    (c) successively storing the state information corresponding to said circuit sections discriminated in said step (b) to have been concerned in the control information transfer, said state information stored in one of the memory address regions corresponding to the block during execution; and

    (d) displaying the storage contents of the memory in accordance with a display command.

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