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Industrial Ethernet Book 103

33 IIoT best practices: guidelines for MQTT architectures MQTT has three distinct features that make it an ideal IIoT protocol: low bandwidth, TLS security and stateful awareness. Among protocols in the pub-sub category, MQTT provides a foundation for building new architectures as long as users follow best practices and effective technical guidelines for implementation. THE INDUSTRIAL AUTOMATION INDUSTRY is benefiting from the incredible opportunities made possible by the Internet of Things (IoT). While the IoT has shown incredible promise within the corporate and consumer environment, the true value of the IoT can be found in the industrial space, and the Industrial Internet of Things (IIoT). The thirst for industrial data has ignited this IIoT movement to bring operational technology (OT) up to speed with its enterprise counterpart, information technology (IT). This movement aims to overcome hurdles that have handicapped the growth of the industrial world, and to connect data across a wide network throughout an organization. The IIoT unlocks data, clearing the way for easy access and shareability. By working with IT, OT can leverage the scalability and flexibility of open technologies to access and share all types of data with every level of an organization. In this article, we’ll provide some best practices when approaching new IIoT infrastructure projects. New IIoT infrastructures There is a lot of hype about the IIoT and many organizations want to leverage the benefits it promises. However, for many organizations, the path to technological adoption seems unclear, and some still question if IIoT will ever happen. Fortunately, with current and emerging offerings, organizations can actually take full advantage of IIoT today. Before making the leap, though, they should recognize that legacy devices are still in use. Planning and patience are required as your team moves forward with an IIoT solution for your organization. As the old saying goes, look before you leap. Build a parallel infrastructure There are still hundreds of millions of proprietary legacy PLCs and devices being used by organizations today, and they will continue to be in use for many years to come. Upgrading all of these devices would be incredibly cost-prohibitive. It would also be very difficult to just switch to a new technology, because making a quick switch could result in a catastrophic failure and loss of revenue. The best approach is to build a parallel infrastructure alongside with your existing installation and gradually transition devices from your old system to a new IIoT infrastructure. Many systems are critical in nature and upgrades could cause outages, which are unacceptable. Building a system in parallel allows you and your organization to compare data from your established system with your new system. The gradual approach helps to make sure your new system works, and is stable before making a complete infrastructure transition. Allow time for testing Migrating to a brand-new IIoT system of a large magnitude requires thought and thorough planning. This is a process that shouldn’t be rushed or taken lightly. Taking your time affords the ability to test your system. As your company gradually builds new infrastructure, testing along the way makes sure that communication is stable. Furthermore, if a failure occurs while you install your new infrastructure, the current system is still available, mitigating any downtime. As your team begins developing a plan for your new IIoT infrastructure, you should start looking at which communication protocols to use in your infrastructure. The protocol chosen will determine the IIoT devices and software for your infrastructure. Take the time to understand the needs of your organization and how your current system is setup. The final solution you choose is a large commitment. Once implemented, your infrastructure will be in place for many years to come. In the next section, we’ll look at MQTT and why it is an ideal communications protocol for IIoT. MQTT as IIoT messaging protocol The entire IIoT solution will heavily depend on the protocol selected, as it is the backbone of your system. Most common IIoT protocols fall into two 11.2017 industrial ethernet book SOURCE: INDUCTIVE AUTOMATION Technology MQTT decouples devices from applications and reduces bandwidth usage. Devices connect directly to a MOM, or the MQTT server, where data is gathered.


Industrial Ethernet Book 103
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