**5. Conclusions**

The event-triggered FD problem of IT2 T-S fuzzy nonlinear networked systems has been studied in this paper. A fault residual system is established by integrating the IT2 fuzzy theory, external disturbance, event-triggered scheme, time delays and parameter uncertainties. In particular, the designed FD filter premise variable could be different from NNSs. The stability conditions and performance criterion have been proposed with the aid of the Lyapunov theory. At last, the validity has been verified by simulation experiments. The results illustrate that the proposed FD method can achieve rapid detection of faults, and the event-triggered scheme reduces the transmission rate and saves wireless communication resources. The responsiveness to different types of faults highlights its low conservativeness. The event-triggered FD problem of NNSs with random cyberattacks and packet losses will be further investigated.

**Author Contributions:** Conceptualization, Z.L., C.Z. and L.W.; methodology, Z.L., F.X. and L.W.; software, C.Z.; validation, Z.L., C.Z., F.X., Z.W. and L.W.; writing—review and editing, Z.L., C.Z., F.X., Z.W. and L.W.; visualization, Z.L.; supervision, L.W.; project administration, L.W. and Z.L.; funding acquisition, L.W., F.X. and Z.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was financially supported by the Heilongjiang Provincial Natural Science Foundation of China [No. LH2021F057], the Fundamental Research Funds in Heilongjiang Provincial Universities [No.135409602,135409102], the Science and Technology Project of State Grid Heilongjiang Electric Power Co., Ltd. [No.5224162000JK], and the Open project of Agricultural multidimensional sensor information Perception of Engineering and Technology Center in Heilongjiang Province [No. DWCGQKF202105].

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
