Design of delay timers based on estimated probability mass functions of alarm durations

Wang, Jiandong; Wang, Zhen; Zhou, Xuan; Yang, Fan

doi:10.1016/j.jprocont.2022.01.002

Cited by 17 publications

(1 citation statement)

References 26 publications

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“…The value of 𝑚 is 5 in figure 1(b). The m-sample delay timer raises (clears) alarms if and only if m consecutive samples are in the alarm (non-alarm) state [7]. Alarm deadband and delay timer have been widely used in practice to remove nuisance alarms in the alarm systems of industrial process facilities [8].…”

Section: Introductionmentioning

confidence: 99%

The HLS-II alarm system optimization for removing nuisance alarms

Xu,

Wang,

Liu

et al. 2024

J. Inst.

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Hefei Light Source II (HLS-II) is a vacuum ultraviolet synchrotron light source. The HLS-II alarm system is responsible for monitoring the alarms of the process variables and distributing the alarm events in time. Nuisance alarms reduce the functionality, credibility and trustworthiness of the alarm system. This paper proposes a method for design alarm deadband and delay timers to remove the nuisance alarm events to the expected ratio. An optimal deadband width is calculated to reduce the alarm events while balancing the effects of reducing the occurrence number of alarm events and increasing the duration of alarm events. If the expected ratio is not met after using the optimal deadband width, the delay timers are set additionally. The Bayesian estimation approach is used to estimate the probability that the delay timers eliminate the alarm events. This method is based on statistical properties of the process variables and can effectively remove nuisance alarm events. Two examples of the HLS-II alarm system are provided to illustrate the proposed method. In the two examples, the optimal deadband removed 99.27% and 88.92% of nuisance alarms respectively.

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Section: Introductionmentioning

confidence: 99%