| CPC G05B 19/056 (2013.01) [G05B 2219/13076 (2013.01)] | 13 Claims |
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1. A master pattern generation method from a ladder logic of a programmable logic controller (PLC), the method comprising:
generating, by a processor, a master pattern to be compared with contacts in the ladder logic of the PLC to determine whether each cycle is normal or abnormal, wherein
the generating the master pattern includes:
generating a relationship between the contacts included in the ladder logic;
generating bars for each cycle from log data of the PLC and links for each cycle;
calculating a statistic of the bars and links included in a plurality of cycles; and
generating h master pattern based on the calculated statistic,
the determination of whether each cycle is normal or abnormal includes:
comparing the master pattern with input data to generate output data indicating whether there are errors for each bar and link, and
detecting, with an artificial neural network trained using the input data and the output data, at which contact and link the error occurs with respect to data of a new cycle, and correcting the error, and
the generating of the relationship between the contacts includes:
removing a manual column from the ladder logic and expanding a path by searching for a step in which contact A that maintains an OFF state as usual and then changes to an ON state is used as an output contact of another step.
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