In addition, PI relies on standard Ethernet technology so it can both draw on a broad selection of Ethernet chips for the implementation of the PROFINET interface on devices and also benefit from the further developments of IEEE technology such as gigabit bandwidths. Furthermore, synchronous networks can be implemented for isochronous applications with TSN. Previously, networks had to be set up separately and integrated in dedicated chips in the devices. This is the only way to ensure not only that PROFINET remains future-proof for users, but also that simpler setups will be possible.
Besides a stack architecture that is easy to integrate and scale, a further crucial goal for the use of the technology is a high degree of determinism and robustness to IP-based traffic that is not real-time capable. The reliability increases, since TSN allows bandwidth to be reserved on the network for individual tasks so they are not disrupted by other traffic. This is especially important, since a variety of protocols will be used side by side in future in Industry 4.0 networks. In this way PI incorporates parallel communication via OPC UA between stations on the system level or from devices on the field level to the cloud right from the start.
However, with the introduction of TSN, it is also necessary to simplify the engineering of the network for more complex systems, until they become plug-and-work-capable networks that permit reconfiguration during ongoing operation. In addition, the TSN mechanisms that arise alongside the real-time protocol procedure offer the options that PI is consistently pursuing.
Karsten Schneider, Chairman of PI, summarizes the benefits of this approach thus: “PI will expand PROFINET with the mechanisms of TSN in layer 2, retaining the application layer on the higher levels. This makes it possible to migrate the applications to the new technology simply and incrementally and to take advantage of the advantages of an open, globally standardized IT technology.”
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