Leung, Andrew Yee TakAndrew Yee TakLeungHu, W.Starr, A. G.2022-03-302022-03-302003https://repository.sfu.edu.hk/handle/sfu/2807Among all kinds of possible faults in a manufacturing system, operational faults occur most often (about 70%). Efficient diagnosis of these faults is critical for improving the availability and productivity of the manufacturing system. This paper presents a hierarchical diagnosis model based on fault tree analysis (FTA) and two other diagnosis models, respectively, based on the logic and sequential control of manufacturing systems which are usually controlled by a programmable logical controller (PLC). With these models working together, the operational faults of a manufacturing system can be diagnosed completely. The models have been successfully applied to a PLC-controlled flexible manufacturing system (FMS) and have achieved good results.enjournal article10.1016/S0924-0136(02)00252-2