METHOD AND APPARATUS FOR DIAGNOSING PLC(PROGRAMMABLE LOGIC CONTROLLER) SELF FAULT AND PLC EXTERNAL FAULT

摘要

PURPOSE: A method and apparatus for diagnosing a PLC(Programmable Logic Controller) self fault and a PLC external fault are provided, which reduces a PLC fault recovery time. CONSTITUTION: A PLC language translator(310) translates a PLC program into a code for a user to recognize and sends it to a PLC fault diagnosis algorithm part(320), which has a self diagnosis function and a mis-input pursuit function and a fault recovery function through a past fault example and a diagnosis per unit function. The apparatus also comprises a PLC fault example data base(330) stores fault examples and provides the fault examples to a fault example data base management part(323). The PLC fault diagnosis algorithm part comprises a self diagnosis part(321) providing information to an operator(500) by reading an error code from a PLC, a miss-input reverse pursuit part(322), the fault example data base management part, a unit diagnosis part(324) and a main control part(325).