A Study of Fault Detection and Diagnosis for PLC Controlled Manufacturing System

摘要

Operational faults detect and diagnose to maintenance personals is a difficult thing. In PLC controlled flexible manufacturing systems, there is no inherent automatic fault finding module in controller itself, so additional diagnostic module needs to be develop. Developed fault finding and diagnostic modules depending on measured data from the inspection machines and sensor data. In this work, a fault detection and diagnostic module is described based on internal PLC program signal data which is acquired through OPC Server. The observed or real-time PLC signal data is compared with normal PLC signal data to find out possible faults or deviations. The data acquisition procedure and the techniques used have been explained in this paper.