Ladder Program Retrieval Device Capable Of Retrieving Ladder Circuits Based On Specified Signal Operation Conditions

Abstract

The invention provides a ladder program retrieval device capable of retrieving ladder circuits based on specified signal operation conditions. Provided is a ladder program retrieval device that includes: search condition specification unit for specifying, as search conditions, a plurality of signals and a logical operation relationship between any two signals included in the plurality of signals; search signal presence determination unit for determining, for each of the plurality of ladder circuits included in the ladder program, whether the ladder circuit includes all of the plurality of signals specified in the search conditions; and search logic presence determination unit for determining, for each of the ladder circuits determined by the search signal presence determination unit to include all of the signals specified in the search conditions, whether or not the ladder circuit includes the logical operation relationship.

Description

technical field [0001] The invention relates to a ladder program retrieval device, in particular to a ladder program retrieval device capable of retrieving a ladder circuit according to a designated signal operation condition. Background technique [0002] When generating a ladder program, verifying (debugging) operation, and diagnosing an abnormality during operation, etc., it is frequently performed to call the relevant ladder circuit on the screen from the ladder program. Therefore, in many cases, a function of searching and extracting a ladder circuit is provided using a signal or command used in a target ladder circuit as a condition. [0003] Usually, when searching for a specific ladder circuit from a ladder program, a signal used in the ladder circuit is specified, and a ladder circuit including the signal is searched to extract a target ladder circuit. The signal of the search condition generally indicates that the signal is designated by a character string such as...

AI Technical Summary

Problems solved by technology

That is, in the case of a ladder circuit, even if it is a circuit with the same logic, the arrangement of operation commands and signals may be different, or a contact point indicating an auxiliary condition may be inserted between them, so only by the arrangement of instructions and the ladder diagram When the comparison of the patterns is judged to be a match, there is a danger of missing the ladder circuit that should be judged to be a match.

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