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NOV-DEC 2018

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INTECH NOVEMBER/DECEMBER 2018 39 SPECIAL SECTION mostly in the research stage. However, technical and vocational colleges are al- ready showing interest in this topic. TSN will become basic knowledge for engi- neers, technicians, and skilled workers. Retraining for different fieldbuses will no longer be necessary. Brownfield, or what will happen to today's protocols? There is a recurring theme in nearly all TSN-related working groups: How do we safeguard the transition to TSN and the supply to existing installations, such as brownfield applications? Emphasis is being placed on making the transition to TSN easy for customers. Existing indus- trial Ethernet protocols are not just going to vanish overnight. Companies using PROFINET, EtherNet/IP, EtherCAT, or a similarly widespread industrial Ethernet protocol today can safely assume they will also be able to operate networks with these protocols—and receive support and replacement parts—in 10 years' time. All industrial Ethernet organizations have models that describe how exist- ing plants can cooperate with new TSN-based devices. The interface to the existing industrial network is made by a gateway (Sercos), with a coupler (EtherCAT), or without any special hardware (PROFINET RT). Especially PROFINET and EtherNet/IP plan to make their complete protocols avail- able right on TSN as layer 2. This makes stepwise transition to TSN possible. TSN as an opportunity TSN will be found in new installations ev erywhere, as well as in the form of is- lands or segments introduced incremen- tally into existing installations. However, with TSN, there will be new players in the industrial Ethernet field. OPC UA, with the new transport protocol PUB/SUB, in conjunction with TSN, is already viewed as a competitor to the classic protocols. For the manufacturers of field devices, this means that the classic industrial Eth ernet solutions, as well as TSN and the new players will have to be supported. TSN makes it possible to create a uniform basis for all industrial com - munications. Once TSN is introduced, layers 1, 2, and 3 of the ISO seven-lay - er model will be unified in industry. Completely new levels of scalability and performance will be possible. n ABOUT THE AUTHOR Volker E. Goller (volker.goller@analog. com) is a systems application engineer with Analog Devices and has more than 30 years of experience with a diverse set of industrial applications, ranging from complex motion control and embedded sensors to TSN technology. A software de- veloper by trade, Goller has developed a wide variety of communication protocols and stacks for wireless and wired applica- tions while actively engaging in fielding new communication standards through involvement in industry organizations. View the online version at www.isa.org/intech/20181206. Analog Input & Output Modules with HART Capability For Rockwell Automation 1734 & 1769

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