Supporting real-time distributed computer-controlled systems with multi-hop P-NET networks |
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| Affiliation: | 1. Department of Informatics Engineering, University of Coimbra, Coimbra, Portugal;2. Federal Institute of Alagoas, Campus Arapiraca, Arapiraca, Brazil;1. Robotics and Internet-of-Things Lab (RIOTU), Prince Sultan University, Saudi Arabia;2. Gaitech International Ltd., China;3. Al-Imam Mohammad Ibn Saud Islamic University, Saudi Arabia;4. King Saud University, Riyadh, Saudi Arabia;5. CISTER/INESC-TEC, ISEP, Polytechnic Institute of Porto, Porto, Portugal;6. LISI Laboratory, National Institute of Applied Sciences and Technology (INSAT), University of Carthage, Tunis 1080, Tunisia;7. LISI Laboratory, Faculty of Mathematical, Physical and Natural Sciences of Tunis (FST), University of El Manar, Tunis, Tunisia;8. Cooperative Networked Intelligent Systems (COINS) Research Group, Saudi Arabia;9. Taif University, Taif, Kingdom of Saudi Arabia;10. Computer and Embedded Systems Laboratory, University of Sfax, Sfax, Tunisia;11. School of Electrical and Information Engineering, Jinan University (Zhuhai Campus), Zhuhai 519070, China;1. School of Computer and Communication Engineering, Northeastern University at Qinhuangdao, Qinhuangdao, China;2. School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao, China;1. College of Computer Science and Technology, Qingdao University, Qingdao 266071, China;2. State Key Laboratory of Cryptology, Beijing 100878, China;4. Shandong Provincial Key Laboratory of Computer Networks, Shandong Computer Science Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China;5. School of Software, Shandong University, Jinan 250101, China |
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| Abstract: | Fieldbus communication networks aim to interconnect sensors, actuators and controllers within process control applications. Therefore, they constitute the foundation upon which real-time distributed computer-controlled systems can be implemented. P-NET is a fieldbus communication standard, which uses a virtual token-passing medium-access-control mechanism. In this paper pre-run-time schedulability conditions for supporting real-time traffic with P-NET networks are established. Essentially, formulae to evaluate the upper bound of the end-to-end communication delay in P-NET messages are provided. Using this upper bound, a feasibility test is then provided to check the timing requirements for accessing remote process variables. This paper also shows how P-NET network segmentation can significantly reduce the end-to-end communication delays for messages with stringent timing requirements. |
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