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MAR-APR 2019

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INTECH MARCH/APRIL 2019 29 SYSTEM INTEGRATION is processed offline and separately from live operational data, such as to determine when rotating equipment is experiencing increased temperatures or vibration and should undergo preventive maintenance. When engineers have gained confi- dence in the IIoT platform, they may choose to use the information to proac- tively modify active control strategies. This overarching concept of using all available data to produce optimal actions is the ultimate goal of any completely connected industrial enterprise. Next, let's look at a typical application. Applying small sensors IIoT sensors for infrastructure are gener- ally small sensors, easily installed even in remote or difficult physical locations. This allows extremely granular installa - tions, providing condition-based sensing exactly where needed, as opposed to a wired installation where it is more impor - tant to centralize devices to minimize the wired infrastructure installation effort. This granular nature also makes wire- less infrastructure monitoring systems very scalable. Users can initially install sensors anywhere to meet immediate needs, and then add more sensors later as funding allows or where experience proves valuable. Figure 4 depicts a basic IIoT installa- tion and integration. Numerous IIoT field de vices are installed as needed in the field and report over a LoRaWAN system to a plug-and-play gateway. This gateway in turn transmits the field data up to an on- premises or cloud-based system, where the data becomes available to any higher- level host or supervisory system. In fact, the cloud connectivity also means there are options to publish the data directly to portable devices, so field personnel can monitor the data from anywhere, espe- cially near the equipment. Host systems could be one or more of the following: the operational control sys - tem, a database and trending package, an- alytical software, or possibly even a system offering advanced machine intelligence algorithms. IIoT systems provide just the kind of "big data" that analytical software needs to do its work. In fact, the cloud im - plementation means that applicable data from multiple sites can be aggregated to look for larger trends, or to compare the different facilities against each other. Process controls have always been the domain of operational technology (OT) personnel, but infrastructure monitoring in recent years has often been dependent on information technology (IT) staff. Although IT staff are proficient at net- working and databases, they are often less experienced with industrial concepts and the nature of time-series process data. Implementing infrastructure condition monitoring with LPWA plug-and-play functionality puts the maintenance and environmental monitoring tasks squarely in the hands of OT personnel, who are best equipped to use it. This results in a far more efficient integration. One other note is that some IIoT sen- sors offer near-field communications (NFC) wireless capability. This very short- range (just a few centimeters) wireless link is not useful for ongoing data trans- mission but does enable common smart- phones to act as local configuration and monitoring tools for sensor status. This is yet another case where IIoT devices can save end users money. Just right wireless Conventional industrial wireless opera- tional networks, such as ISA100 Wireless, will continue to experience a growing presence in automation systems for high-performance control and moni- toring. However, to truly take advan- tage of widespread IIoT advancements, it is important to adopt LPWA network- ing technology such as LoRaWAN to economically integrate multitudes of sensors on a sitewide basis. LPWA is a just-right fit of cost, power consumption, range, and bandwidth for monitoring infrastructure condi - tions such as temperature and vibra- tion. This data is key to preventative and predictive maintenance programs. The nature of LPWA devices means they are economical to install initially, since no wiring is required, and they are also cost effective on a long-term basis due to minimal maintenance re quirements. Operational and LPWA infrastruc- ture wireless networking work espe- cially well in conjunction with each other, because the combination covers such a wide range of wireless needs. Used together in a sitewide industrial wireless network, they deliver a com - prehensive balance of immediate and proactive plant operations. n ABOUT THE AUTHOR Shuji Yamamoto (shuuji.yamamoto@ jp.yokogawa.com) is the wireless promo - tion manager at Yokogawa's marketing headquarters for External Affairs & Tech - nology MK Center. He joined Yokogawa after completing a master's degree in elec - tronic engineering from Shinshu University with a specialty in high frequency research. He has had a variety of responsibilities with the company over his career, all primarily related to wireless networking and IIoT. View the online version at www.isa.org/intech/20190404. Figure 4. LPWA LoRaWAN in action: This diagram depicts a basic installation where many field-located Yokogawa Sushi Sensor devices connect through a plug-and-play gateway. The data is transmitted to an on- premises or cloud-based system for use by a higher-level host system or portable devices. NFC connectivity enables local configura- tion and monitoring of the sensors with a smartphone. RESOURCES "Essential wireless network layout concepts" www.isa.org/intech/201708basics "Getting IIoT to live up to the hype" www.isa.org/intech/201702web "Convergence and commercial momentum" www.isa.org/intech/20170404

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