Safe-WirelessHART: A Novel Framework Enabling Safety-Critical Applications over Industrial WSNs. Yang, D., Ma, J., Xu, Y., & Gidlund, M. IEEE Transactions on Industrial Informatics, 2018. doi abstract bibtex Industrial wireless sensor networks (IWSNs) have mainly been used to monitor applications, but recently an interest in control and safety applications has emerged. Functional safety and communication in open transmission systems have been laid down in the IEC 61784-3-3 standard. The standard is based on a cyclic polling mechanism, which consumes a considerable amount of bandwidth; since existing IWSNs are very resource-constrained this becomes a major challenge. To overcome this problem, this paper proposes a novel framework that uses an event-triggered failsafe mechanism based on synchronous wired polling and wireless time-slotted time division multiple access (TDMA). We analytically derive the minimum and maximum bound for the most important metric for safety-critical applications, Safety Function Response Time (SFRT). A new metric, Normal State Interrupt Time (NSIT), is proposed in this paper. Furthermore, we also implement the proposed framework by using the WirelessHART standard. The results are compared to the classical time-triggered approach used in the IEC 61784-3-3 standard. The obtained results show that the proposed framework can reduce the bandwidth usage by 90% and support safety-critical applications that require a SFRT less or equal to 150 ms.
@article{yang_safe-wirelesshart:_2018,
title = {Safe-{WirelessHART}: {A} {Novel} {Framework} {Enabling} {Safety}-{Critical} {Applications} over {Industrial} {WSNs}},
issn = {1551-3203},
shorttitle = {Safe-{WirelessHART}},
doi = {10.1109/TII.2018.2829899},
abstract = {Industrial wireless sensor networks (IWSNs) have mainly been used to monitor applications, but recently an interest in control and safety applications has emerged. Functional safety and communication in open transmission systems have been laid down in the IEC 61784-3-3 standard. The standard is based on a cyclic polling mechanism, which consumes a considerable amount of bandwidth; since existing IWSNs are very resource-constrained this becomes a major challenge. To overcome this problem, this paper proposes a novel framework that uses an event-triggered failsafe mechanism based on synchronous wired polling and wireless time-slotted time division multiple access (TDMA). We analytically derive the minimum and maximum bound for the most important metric for safety-critical applications, Safety Function Response Time (SFRT). A new metric, Normal State Interrupt Time (NSIT), is proposed in this paper. Furthermore, we also implement the proposed framework by using the WirelessHART standard. The results are compared to the classical time-triggered approach used in the IEC 61784-3-3 standard. The obtained results show that the proposed framework can reduce the bandwidth usage by 90\% and support safety-critical applications that require a SFRT less or equal to 150 ms.},
journal = {IEEE Transactions on Industrial Informatics},
author = {Yang, D. and Ma, J. and Xu, Y. and Gidlund, M.},
year = {2018},
keywords = {IEC 61784-3-3, IEC Standards, IWSN, Reliability, SFRT, Safety, Time division multiple access, Time factors, Wireless communication, Wireless sensor networks},
pages = {1--1}
}
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To overcome this problem, this paper proposes a novel framework that uses an event-triggered failsafe mechanism based on synchronous wired polling and wireless time-slotted time division multiple access (TDMA). We analytically derive the minimum and maximum bound for the most important metric for safety-critical applications, Safety Function Response Time (SFRT). A new metric, Normal State Interrupt Time (NSIT), is proposed in this paper. Furthermore, we also implement the proposed framework by using the WirelessHART standard. The results are compared to the classical time-triggered approach used in the IEC 61784-3-3 standard. 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