Feature: Industrial
Two factors that have slowed the
adoption of Ethernet in the industrial space are jitter – the variation in the delay between packets, and latency – the time it takes a packet to reach its destination. Since the original Ethernet specification lacked determinism, it was believed that the protocol could not be used reliably in many machine applications where this lack of determinism could lead to poor quality or even machine damage. Time-Sensitive Networking (TSN) is
solving the issue of standardised real- time communication based on standard communication hardware. TSN is an extension of standard Ethernet that regulates the data communication in Layer 2; see Figure 1. It’s important to note that TSN is only
a “pipe” for getting data from one place to another in a deterministic way. It does not address higher-level application functions, such as safety or motion control. Te real value of TSN is the ability for OT to
DDS over TSN is the most interesting development in industrial communications since Ethernet
virtualise industrial networks the same way many organisations have consolidated their server infrastructure in the cloud. Enabling multiple types of traffic to share the same networking hardware is the very basis of convergence.
DDS over TSN Together, DDS and TSN lead to a converged approach for handling real- time communications in industrial applications. DDS by design is network transport agnostic. DDS QoS enables
deterministic applications to be built regardless of the transport. DDS relies on the underlying network transport for hard real-time requirements. TSN makes standard Ethernet in real time and enables the convergence of multiple kinds of traffic on the same network (virtualisation). DDS provides a deterministic, platform-independent data-centric framework for the desing and implementation of highly distributed systems from the edge to the cloud. DDS over TSN (Figure 2) is the most
interesting development in industrial communications since the development of Ethernet. Te combination of these two standards brings real-time, virtualised (converged) data centricity to industrial automation. Te challenge of turning raw data into actionable information that can be acted upon in real time can now be met, without the inherent architectural limitations of MQTT, OPC UA and OPC UA pub/sub.
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www.electronicsworld.co.uk September 2023 21
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