Facility diagnosis method using facility diagnosis system

A facility diagnosis method using a facility diagnosis system comprising an imaging module (110) configured to photograph a facility, in which a facility controller on which a PLC is mounted is embedded, and a diagnostic module (120) comprising hardware, on which software for diagnosing a failure of the facility is mounted, the facility diagnosis method comprising:

• a diagnosis event generating step (S11) of receiving and detecting a PLC memory map access signal (P) output by the facility controller, by the diagnostic module (120), and generating diagnosis events for kinds corresponding to a plurality of preset event conditions, in the diagnostic module (120);
• a storage range setting step (S12) of arbitrarily selecting ranges of state information and a data value of a PLC memory area, which is to be stored at a diagnosis event generation time point, and setting a time area of a before/after range with reference to the diagnosis event generation time point by the diagnostic module (120);
• and
• a file storing step (S13) of storing the state information and the data value of the PLC memory area in the range selected in the storage range setting step in real time, by the diagnostic module (120),
• wherein the diagnostic module (120) is configured to selectively perform:
• a master memory pattern setting step (S21) of mounting memory pattern recognition software, storing state information and a data value of the PLC memory area during one cycle of a normal state operation of the facility, and setting the state information and the data value stored, as a master memory pattern;
• and
• a memory pattern notifying step (S22) of reading the PLC memory area in real time during an operation of the facility, comparing the read PLC memory area with the master memory pattern, and displaying an area in which the read PLC memory does not coincide with the master memory pattern, and
• wherein in the file storing step (S13),
• the state information and the data value of the PLC memory area are stored in the form of data files for kinds of diagnosis events and generation dates and times, areas for an input/output, an internal relay, a link relay are converted in unit of bits to display an operational state thereof, areas for a data register and a link register are converted in unit of decimal numbers after being read in unit of words to be displayed and stored, and to be provided to a user.