In this paper, a method of the fault diagnosis based on FCM (Fuzzy Cognitive Map) is proposed. FCM which can store uncertain causal knowledge is essentially fuzzy signed directed graphs with feedback. The proposed basic fault diagnostic algorithm is considered as a simple transition from Shiozaki's signed directed graph method to FCM framework. It can simply identify the origin of the fault and can further be expanded to hierarchical fault diagnostic scheme. In particular, as the proposed scheme takes a shorter computing time in comparison with other methods, it can be used for on-line fault diagnosis of large and complex processes where conventional fault diagnostic methods can not be applied. Examples highlighting the use of the proposed scheme are presented.
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