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Digitalization sets a high standard for industrial communication. Siemens is already relying on the rapidly growing open-communication standard Industrial Ethernet – with PROFINET at the field level and OPC UA at the control level. But Siemens is taking it one step further: with the Ethernet-based standard TSN (Time-Sensitive Networking) for reserved bandwidths, Quality of Service (QoS) mechanisms, low transmission latency, and parallel transmission of multiple protocols – including real-time-capable ones – in industrial networks.
The upcoming IEC/IEEE 60802 standard is a project of IEC SC65C/MT9 and IEEE 802, so experts from standard Ethernet and the application protocols above work closely together. This standard will define a TSN profile for industrial automation in which certain functions, configuration models with the associated protocols and options can be selected from a wide range of options. This is the only way to achieve a convergent network, i.e. different protocols use the same network.
In future, all components for setting up a TSN network must be standardized according to IEC/IEEE 60802 (TSN-IA). The specification is based on corresponding use cases, a first official version is expected in 2022.
(More FAQs about TSN will follow. The already published FAQs can be found in the "What is TSN" section further down the page.)
While industrial control systems are dependent on real-time communication, IT systems rely primarily on open access to data. That’s why companies operate these networks separately. In the face of increasing digitalization, this separation must now be replaced by open, end-to-end networking that permits flexible, deterministic production. TSN (Time-Sensitive Networking) creates a standardized basic technology within the framework of IEEE 802.1 for guaranteed Quality of Service (QoS) and increased demands in the Ethernet. TSN comprises a series of individual standards that exclusively pertains to the OSI layer 2 of communication. This means that the user interface remains unchanged even with TSN.
From the automotive industry and machine-building to the food and beverage industry: TSN offers decisive advantages for industrial production, including reserved bandwidths, Quality of Service (QoS) mechanisms, low transmission latency, and parallel transmission of multiple protocols – including real-time ones. Siemens will be relying on TSN to help shape the digital transformation of industrial networks – from the field level and machine-to-machine (M2M) communication to the control and operator levels.
TSN has already gotten off to a promising start. As part of its ongoing development, it’s being tested at Labs Network Industrie 4.0 (LNI4.0). LNI4.0 is connecting testing environments and installations throughout Germany to further the advance of Industrie 4.0, and Siemens is one of the founding members. Along with a number of other industrial enterprises, the company is doing everything it can to test TSN interoperability with multiple vendors, and is conducting research in the test bed to assess the potential of TSN for M2M communication and machine networking all the way to the cloud. The knowledge obtained will be made available to standardization committees as needed for use in future development.
Basically, Ethernet with TSN supplements the existing Ethernet mechanisms in the areas of Quality of Service (QoS), including bandwidth reservation, as well as synchronization, low latencies, and even seamless redundancy.
The applications signal their communication requirements on the network and are guaranteed the requested QoS from the network. The various connections run in streams that enjoy bandwidth protection thanks to resource allocation in the memories of Ethernet switches. Basically, each of these streams can become real time-capable. As a result of these encapsulated streams, TSN also makes it possible to run multiple real time-capable protocols simultaneously in a single network (network convergence). This is fundamentally different from today’s Ethernet-based real-time protocols where the network only allows one real time-capable protocol.
A "TSN-capable" hardware block is needed for TSN; the currently installed Ethernet blocks generally cannot be expanded to TSN via software.
It is foreseeable, however, that the "standard Ethernet block" will be a TSN-capable Ethernet block in the future. That is the main motivating factor for Siemens to put PROFINET on TSN. All of the major block manufacturers have already begun to develop, or have at least announced that they will develop hardware blocks with TSN mechanisms. For device manufacturers, this results in many possibilities for the various hardware designs of their devices.
Yes. OPC UA and PROFINET are protocols which are used by the ISO-OSI model in the layers 5 to 7. Both OPC UA and PROFINET will use TSN as basic technology of layer 2.
OPC UA has its strengths in vertical communication and networking of machines at control level, while PROFINET meets all requirements in the field. That's why the strategy at Siemens stays the same:
OPC Unified Architecture (OPC UA) is the standard for exchanging data for secure, reliable, manufacturer, and platform-independent industrial communication.
OPC UA is perfectly suited for exchanging data among various operating systems between applications from many diverse automation component manufacturers and has been defined for vertical communication.
OPC UA is available in two versions – client/server and PubSub (publish/subscribe).
OPC UA originated in vertical communication and is now becoming established in the market for M2M communication as well.
The need for real-time communication on the controller level should essentially be limited to controller-to-controller communication. For technical reasons, only the OPC UA PubSub method can be combined with TSN. Client/server accesses naturally also run via the Ethernet-based network with TSN mechanisms (a so-called TSN network), but, since they are TCP/IP-based, cannot be mapped in real-time capable and bandwidth-protected streams.
How might M2M communication with TSN look like in practice? Going beyond the theoretical, Siemens already has a trade show model that demonstrates this in practice using two robots with synchronized movements. Each of the robots communicates with a SIMATIC controller via PROFINET. Both controllers are synchronized via OPC UA PubSub (publish/subscribe) based on TSN. Thanks to bandwidth reservation, data transmission in the TSN network is precisely predictable, independent of load.
To demonstrate how TSN communication and standard Ethernet communication can be used in the same network, data in the model is also transmitted from the controller to a cloud – like MindSphere – via a communication processor.
The development of industrial networks never stands still. What is Siemens doing with TSN? How will you and the top-two technologies OPC UA and PROFINET benefit from Time-Sensitive Networking? And how can you optimize your network with TSN? Our experts are happy to answer these questions and many more.
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