Coexisting wireless sensor networks in cyber-physical production systems

et al. 2018

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Abstract. In the context of the Industry 4.0 initiative, Cyber-Physical Production Systems (CPPS) or Cyber Manufacturing Systems (CMS) can be characterized as advanced networked mechatronic production systems gaining their added value by interaction with the ambient Industrial Internet of Things (IIoT). In this context appropriate communication technologies and standards play a vital role to realize the manifold potential improvements in the production process. One of these standards is IO-Link. In 2016 more than 5 million IO-Link nodes have been produced and delivered, still gaining increasing acceptance for the communication between sensors, actuators and the control level. The steadily increasing demand for more flexibility in automation solutions can be fulfilled using wireless technologies. With the wireless extension for the IO-Link standard, which will be presented in this article, maximum cycle times of 5 ms can be achieved with a probability that this limit will be exceeded to be at maximum one part per billion. Also roaming capabilities, wireless coexistence mechanisms and the possibility to include battery-powered or energy-harvesting sensors with very limited energy resources in the realtime network were defined. For system planning, setup, operation and maintenance, the standard engineering tools of IO-Link can be employed so that the backward compatibility with wired IO-Link solutions can be guaranteed. Interoperability between manufacturers is a key requirement for any communication standard, thus a procedure for IO-Link Wireless testing is also suggested.

Section: Io-link Wireless Coexistence Mechanismsmentioning

confidence: 99%

Section: Io-link Wireless Testingmentioning

confidence: 99%

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IO-Link Wireless enhanced factory automation communication for Industry 4.0 applications

et al. 2018

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“…All these imperfections influence the frame and bit error probabilities (FEP, BEP), which are integral indicators of the system performance. As frequency bands for the operation of wireless devices are limited resources, many wireless communication systems have to share the same frequency bands, especially the ISM (industrial, scientific, medical) frequency band in the 2.4 GHz range, which is one of only a few bands that is available worldwide (Cammin et al, 2016). Coexistence mechanisms are taken into account in most wireless standards, where a competing coexistence environment often degrades the performance of a wireless system in terms of lowered data throughput and/or increased de-184 C. Cammin et al: Test method for narrowband F/TDMA-based wireless sensor/actuator networks (TDMA) schemes for media access, whereby the radio channel is subdivided into time slots which are assigned to the different devices (e.g., Krush et al, 2016;Heynicke et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Test method for narrowband F/TDMA-based wireless sensor/actuator networks including radio channel emulation in severe multipath environments

et al. 2018

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Abstract. A test method for narrowband wireless sensor/actuator networks is presented, facilitating affordable and efficient performance and compliance tests prior to the deployment of the wireless communication systems. Commonly used channel models are examined to derive a worst-case test scenario. Employing frequency/time division multiple access (F/TDMA) techniques and protocol synchronization, a new and efficient test method is suggested, where the equipment under test (EUT) is evaluated under the worst-case scenario. A cost-efficient channel emulator is introduced to emulate fading in multipath environments. Also, industrial interferes can be included in the setup. Furthermore, a procedure to test wireless devices with integrated, non-detachable antennas is presented.

“…No interference between the WCS and the WLAN systems could have been measured in this laboratory test setup. An additional detailed study on the coexistence behavior of the WCS is presented in Cammin et al (2016). …”

Section: Coexistence Testmentioning

confidence: 99%

A wireless communication system for energy and environmental monitoring

et al. 2017

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Abstract. Custom-fit communication systems are key elements in modern cyber-physical sensor systems. Therefore a wireless communication system (WCS) for sensor/actuator communication has been developed to facilitate energy and environmental monitoring on the shop floor of industrial production sites. Initially, the distinct demands and requirements are described. As the WCS has been designed for new installations as well as for retrofitting already installed facilities, the WCS has to be able to coexist with other wireless communication systems already allocated in the same frequency band. The WCS handles measurement data from both, energy-autarkic sensors and fast line-powered sensors. Mobile users in the field equipped with mobile devices are served by the system, too. A modular hardware concept has been chosen for easy system modification or for the integration of new wireless standards. Finally, measured results for the coexistence capability are presented.