Traffic-Aware Configuration of OPC UA PubSub in Industrial Automation Networks

TL;DR

The paper addresses the lack of systematic guidelines for mapping industrial traffic specifications to OPC UA PubSub configurations, which can undermine real-time performance. It proposes traffic-aware PubSub configuration guidelines derived from industrial traffic standards and TSN practices, focusing on DSM types, delta framing, keep-alives, encoding, transport profiles, and dataset ordering. The authors validate the approach through an industrial use-case, illustrating how correct mappings improve latency, throughput, and predictability, while misconfigurations lead to degraded performance. The work provides a practical pathway to robust, interoperable OPC UA PubSub deployments in Industry 4.0 environments and identifies avenues for future experimentation with TSN interactions.

Abstract

Interoperability across industrial automation systems is a cornerstone of Industry 4.0. To address this need, the OPC Unified Architecture (OPC UA) Publish-Subscribe (PubSub) model offers a promising mechanism for enabling efficient communication among heterogeneous devices. PubSub facilitates resource sharing and communication configuration between devices, but it lacks clear guidelines for mapping diverse industrial traffic types to appropriate PubSub configurations. This gap can lead to misconfigurations that degrade network performance and compromise real-time requirements. This paper proposes a set of guidelines for mapping industrial traffic types, based on their timing and quality-of-service specifications, to OPC UA PubSub configurations. The goal is to ensure predictable communication and support real-time performance in industrial networks. The proposed guidelines are evaluated through an industrial use case that demonstrates the impact of incorrect configuration on latency and throughput. The results underline the importance of traffic-aware PubSub configuration for achieving interoperability in Industry 4.0 systems.

Figures (2)

• Figure 1: OPC UA PubSub network message generation process and component interactions
• Figure 2: Industrial automation use case illustrating communication between field devices, edge node, and cloud services in four zones