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Method and apparatus for block move re-addressing in ladder logic programs

  • US 5,243,511 A
  • Filed: 11/29/1989
  • Issued: 09/07/1993
  • Est. Priority Date: 06/30/1989
  • Status: Expired due to Term
First Claim
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1. A method of transforming programmable logic controller addresses in a plurality of ladder logic instructions on a computer, comprising the steps of:

  • (a) retrieving a block of ladder logic instructions from a data storage device attached to the computer in response to a command accepted from an operator into the computer;

    (b) displaying a re-addressing screen on a monitor attached to the computer in response to a command accepted from the operator into the computer, wherein the re-addressing screen contains a first Address column for displaying currently used addresses in the retrieved block, a second Fix-up column for accepting a new address identifier entered by the operator indicating changes to make to the currently used addresses in the retrieved block, and a third Type column for accepting a transformation type identifier entered by the operator indicating a type of operation to be performed on the currently used addresses to create proposed new addresses; and

    (c) calculating the proposed new addresses for the retrieved block using the computer, wherein the proposed new addresses are entered by the operator in the second Fix-up column when the third Type column contains a Base identifier, and wherein the proposed new addresses are calculated when the third Type column contains a Relative identifier by adding all intervening Relative addresses to a most prior Base address to generate the proposed new addresses.

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