classic | mobile


SA Instrumentation & Control Buyers' Guide

Technews Industry Guide - IIoT 2018

Technews Industry Guide - Maintenance, Reliability & Asset Optimisation


OPC as a transformational industrial technology
May 2012, IT in Manufacturing

The OPC Foundation has been working to help solve communication and connectivity problems between plant and factory floor devices and host systems and applications since 1995. Virtually every end user, OEM and automation supplier employs OPC standards, such as OPC Data Access (OPC DA), OPC Alarms and Events, (OPC A&E), and OPC Historical Data Access (OPC HDA), to establish communications and connectivity between disparate devices.

However, no longer is connecting devices at the field, control, and operations levels sufficient; today’s users also need to connect plant devices, applications and systems up to the enterprise level. Many OPC users have also expressed concerns about the security features of OPC communications, which previously were limited with the early versions of OPC classic communications.

The OPC Foundation recognised the opportunity to enhance interoperability and provide platform interoperability by developing new specifications through participation by a new category of enterprise and embedded suppliers in OPC Foundation activities. The new specification – OPC Unified Architecture (OPC UA) – has been demonstrated to improve secure interoperability between all plant equipment and systems and between the plant and enterprise, helping eliminate islands of information.

The questions are: Is OPC UA real? Have suppliers begun to incorporate it within their solutions? And, if so, how are users taking advantage of these solutions? This article, based on the session, ‘Transforming manufacturing with OPC UA: From embedded to the enterprise’, at the recent ARC World Industry Forum in Florida, addresses these questions.

Embedded OPC UA

The OPC UA specifications, initially released in 2006, integrate functionality from the existing OPC specifications (OPC DA, OPC A&E, OPC HDA) into a comprehensive service-oriented architecture. OPC UA adds essential new properties, including platform independence, scalability, high availability, new security mechanisms, and web services. OPC UA has two dimensions:

1. To provide secure interoperability at the automation level by embedding the technology within plant-level devices and applications.

2. To extend OPC communications from the device and automation levels up to enterprise applications and systems.

Embedded OPC UA is based on an attractive lightweight architecture, with the minimal embedded OPC UA implementation using an efficient binary communication protocol. As a result, embedded OPC UA can be ported to many embedded operating systems, including proprietary real-time operating systems.

Embedding OPC UA on a chip

Liam Power, technical director at Embedded Labs, a software company based in Waterford, Ireland, presented ‘OPC UA on a chip, redefining automation architecture.’ Liam cited examples of OPC UA applications embedded on a chip being used to provide connectivity for scheduling, control, visualisation, logging, reporting and productivity applications.

Liam described how OPC UA embedded in low-cost microchips will enable seamless communication from the field device level all the way up to MES applications. He stated that OPC UA will soon be embedded throughout the automation system in everything from serial fieldbus to OPC gateways, PLCs/PACs, I/O blocks, motor drives and sensors and actuators. Liam also predicts that, by the year 2020, less than one in 1000 OPC UA servers sold will be as installable software for PCs and that the installed base of embedded OPC UA devices will exceed 50 million units.

Embedded OPC UA integrated into PLCs

In his presentation, Christian Schulze, business development manager for Beckhoff Automation, discussed how his company has incorporated embedded OPC UA into the architecture of its products. According to Schulze, OPC UA has been embedded into its Automation Controller series, which includes PLC, motion control and graphical user interface functionality. The embedded OPC UA server is integrated with DA (data access), HDA (historical data access), and A&E (alarm and events). The embedded OPC UA client is already integrated with IEC61131-3 programming software function blocks. Embedded controllers acting as an OPC UA client can initiate communications to other OPC UA server-enabled field devices and, in the near future, to HMI/MES software acting as an OPC UA server.

Embedded OPC UA found at all automation levels

Mitch Vaughn, chief technologist, HMI Center of Competence, Siemens, presented how the company integrates its solutions using embedded OPC UA. According to Vaughn, Siemens introduced its first OPC UA-based product in 2008. Today, one of its products has been certified as OPC UA-compliant, with ten more products in the immediate pipeline. He explained how Siemens plans to use embedded OPC UA solutions at all automation levels. Future products will include numeric and motion control, drive management and diagnostics, industrial network management and analytical devices.

The benefits of OPC UA include standard interfaces across all automation levels, operating system independency and a higher degree of security compared to ‘classic’ OPC. OPC certification for OPC UA products will also help ensure better interoperability and higher customer satisfaction through improved robustness.

Embedded OPC UA enables operational excellence

In his presentation, John Krajewski, senior product manager HMI/Supervisory for Invensys Operations Management, discussed how embedded OPC UA will serve as a key enabler and one of the primary real-time system connectivity tools within the company’s InFusion enterprise control system, including the ArchestrA System Platform, ArchestrA Workflow, Trident safety instrumented systems, and SimSci-Esscor ROMeo plant optimisation software. According to Krajewski, these encourage control excellence, people excellence, safety excellence and asset excellence, respectively.

OPC UA plays key role in ODVA’s collaboration with OPC Foundation

Katherine Voss, executive director of ODVA, presented a vision shared with the OPC Foundation for machinery integration in the manufacturing sector. ODVA, a vendor member organisation founded in 1995, has approximately 275 global vendor members. As a standards development organisation and certification body, it manages and promotes EtherNet/IP, DeviceNet and other ODVA technologies. In March 2011, ODVA announced a machinery initiative in partnership with OPC Foundation and Sercos International to foster cross-collaboration on topics of mutual interest for machinery applications.

Embedded OPC UA deployed in drilling automation

Clinton Chapman, drilling automation programme architect for Schlumberger, presented how the company uses embedded OPC UA in a drilling automation application. Chapman explained that since so many different organisations (owner-operator, equipment suppliers, service companies, etc.) are involved in drilling automation, it makes it difficult to provide integration points. This is due primarily to security and differences in equipment.

This Society of Petroleum Engineers Drilling System Automation Technical Section (DSA-TS) was formed to ‘accelerate the uptake of drilling systems automation by supporting initiatives that communicate the technology, standardise its nomenclature, promote lessons learned/best practices, and help define its value proposition.’

Chapman said that the first phase of this project was to decide on a protocol and tags for control. DSA-TS selected embedded OPC UA as the protocol and to generate a set of tags that could be used to control the systems. OPC UA was chosen because of general agreement that OPC has broad industry support, because OPC UA components are available off-the-shelf with drivers and (freed from the limitations of COM/DCOM) OPC UA offers an attractive security model. This was particularly important because service companies and other third parties are typically involved during the drilling process. Also, both compatibility with multiple HMI/Scada systems and the availability of OPC DA-to-OPC UA converters strongly influenced the decision to move forward.

For more information contact Paul Miller, ARC Advisory Group, +1 781 471 1126,,

Share via email     Share via LinkedIn   Print this page

Further reading:

  • Key digital transformation IT concepts for operations
    December 2018, IT in Manufacturing
    Rather than focus on the digital transformation IT concepts through a technical lens, this article looks at them in terms of their implication on industrial operations.
  • Data centre management as a service
    December 2018, IT in Manufacturing
    DMaaS aggregates and analyses large sets of anonymised customer data that can be enhanced with machine learning.
  • Operator guided solutions
    December 2018, Adroit Technologies, IT in Manufacturing
    At parts assembly production sites, where parts are picked from stock, it is almost inevitable that picking mistakes will occur. As parts become more complex and their component types increase, the problem ...
  • Software for low voltage distribution planning
    November 2018, ElectroMechanica, IT in Manufacturing
    New software from Hager facilitates planning and configuration of low voltage switchgear.
  • SKF ups the digital ante at ­Göteborg plant
    November 2018, SKF South Africa, IT in Manufacturing
    Swedish group, SKF, has been implementing digital transformation since 2015, investing close to €19 million to carry out its digital revolution at the Göteborg plant which has, for over a century, been ...
  • 3D software eliminates ­programming
    November 2018, ASSTech Process Electronics + Instrumentation, IT in Manufacturing
    More and more industrial users are discovering the potential of three dimensional software-aided object measurement. With the VisionApp 360 software, Wenglor now offers a smart tool that makes 3D object ...
  • Advanced data management from Siemens
    November 2018, Siemens Digital Factory & Process Indust. & Drives, IT in Manufacturing
    Siemens is innovating its data management software for process analytical technology (PAT) with Simatic Sipat version 5.1, which allows users to monitor and control the quality of their products in real-time ...
  • The 5 stages of cybersecurity awareness
    October 2018, IT in Manufacturing
    Before any of these recommendations can be implemented, managers must first understand and accept the risks they face and the potential consequences. An understanding of human behaviour can help. The ...
  • How adding services to products could start your journey towards an Industry 4.0 solution
    October 2018, Absolute Perspectives, This Week's Editor's Pick, IT in Manufacturing
    For manufacturers, digital transformation involves understanding a range of new technologies and applying these to both create new business and to improve the current operation. Industry 4.0 provides ...
  • Energy management software
    October 2018, Yokogawa South Africa, IT in Manufacturing
    Energy management solutions from KBC, a subsidiary of Yokogawa Electric Corp.
  • Using IIoT analytics to build customer solutions
    October 2018, Parker Hannifin Sales Company South, IT in Manufacturing
    Parker’s Voice of the Machine platform contextualises the data collected from machines.
  • Key considerations when designing IIoT networks for smart businesses
    October 2018, RJ Connect, IT in Manufacturing
    In the era of the IIoT, industries have opportunities to become more productive, more efficient and more dynamic. For example, the IIoT provides businesses with new capabilities such as dashboards that ...

Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronic Buyers Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Terms & conditions of use, including privacy policy
PAIA Manual


    classic | mobile

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.