OPC Foundation has released a lot of news at the end of 2020. Its working groups have been busy.

  • Cloud Library with CESMII
  • Field Level Communications
  • ECLASS Standard for M2M Communication
  • Update to PLCOpen 61131-3 specification

Cloud Library

The OPC Foundation, in collaboration with CESMII, is pleased to announce the launch of the “OPC UA Cloud Library” Joint Working Group (JWG). The goal of the JWG is to specify how OPC UA information models of machines, SCADA and Manufacturing Execution Systems will be stored in and accessed from a cloud-based database.  Such a database will enable manufacturers to draw from a wide range of OPC UA information models and profiles for use in their pre-built shopfloor and business digitalization applications.

Collaboration between the OPC Foundation and the Smart Manufacturing Institute is a natural fit given their complementary efforts. On one hand, the US government-backed Smart Manufacturing Institute sets out to help accelerate the adoption of Smart Manufacturing by businesses of all sizes by enabling frictionless movement of information (data and context) between real-time operations and the people and systems that create value in their organizations. On the other hand, the OPC Foundation created a globally adopted open data interoperability standard via its OPC UA specification. The specification’s information modeling capabilities and secure, scalable communications made it a cornerstone of Industrie 4.0 and virtually every other national Industrial IoT initiative. By working together, CESMII and the OPC Foundation aim to enable the broadest range of US manufacturers and beyond to innovate and go-to-market in their digital transformation using the right data modeling foundation.

Field Level Communications

OPC Foundation announces today that its Field Level Communications Initiative has accomplished a significant milestone in the ongoing project by completing their initial release candidate with the focus on the Controller-to-Controller (C2C) use case. In addition, a technical paper has been published that explains the technical approach and the basic concepts to extend OPC UA to the field level for all use cases and requirements in Factory and Process Automation.

Peter Lutz, Director Field Level Communications of the OPC Foundation says: “We are happy about the progress that our working groups have made over the last months, despite COVID-19 and the associated restrictions. The initial release candidate is a major achievement because it is used to build prototypes and to create test specifications that will be converted to corresponding test cases for the OPC UA certification tool (CTT). Furthermore, it lays the foundation for specification enhancements to also cover the Controller-to-Device (C2D) and Device-to-Device (D2D) use cases in the next step.”

Since the start of the Field Level Communications Initiative in November 2018 more than 300 experts from over 60 OPC Foundation member companies have signed up for the various technical working groups to create the technical concepts and elaborate the specification contents for extending the OPC UA framework for field level communications, including Determinism, Motion, Instruments and Functional Safety.

Cooperation with ECLASS

An important step for interoperability in the field of M2M communication: the OPC Foundation and ECLASS e.V. signed a cooperation agreement.

The goal of this cooperation is to combine the power of the OPC UA and ECLASS standards to better enable M2M interoperability via seamless communication of data and semantics using a standardized set of interfaces. To serve as the basis for semantic interoperability across full product life cycles in an international application environment, a manufacturer and industry independent standard for product description is needed. Once created, such a standard can serve as a semantic reference for the Internet of Things. The ECLASS standard, developed by ECLASS e.V. meets these requirements in a unique way.

The OPC UA standard enables secure transmission of data and facilitates the definition and dynamic exchange of its underlying structure via robust OPC UA information modeling functionality. Standardized information models implemented using OPC UA are called OPC UA Companion Specifications, which taken together can serve as common libraries of Information Models. Products utilizing OPC UA Companion Specifications enable seamless 3rd party data interoperability in the operating phase in the product lifecycle. Today, ECLASS identifiers are already being used in various Companion Specifications. 

Update to PLCOpen OPC UA for IEC61131-3

The OPC Foundation, in collaboration with PLCopen, announced the release of v1.02 of the “OPC UA for IEC61131-3” specification. Building on the first version of the specification, the joint working group added: 

  • support for all datatypes defined in the 3rd edition of IEC61131-3
  • an optimized, machine-readable version of the information model (i.e. nodesetfile) 
  • compliance with enhanced specification templates to support the tool chain used to generate validated information models
  • inclusion in the global online searchable specification reference 
  • OPC Foundation Compliance Test Tool (CTT)  test cases for validation of vendor implementations of “OPC UA for IEC61131-3”

Founded in 2008, this joint working group has the goal of expressing IEC 61131-3 information models using OPC UA.  By doing so, an IEC6-61131-3 PLC project that is loaded onto different control platforms can be displayed in a standardized form and made available for communication via the controllers’ OPC UA servers.

“This first step harmonizes the access of the project running in the controller” says Eelco van der Wal, Managing Director of the PLCopen organization. “With this an unprecedented transparency is created in the communication in industrial automation, enabling the configuration of the communication much faster and independent of the network and suppliers. For this reason, many suppliers have implemented this, providing their users with the ease of use in communication.”

In addition to the server specification “UA for IEC61131-3” the group also worked very successfully on the “client specification” which was originally released in 2014. The implementation of this functionality on a controller makes it possible to initiate a communication session to any other available OPC UA Server. The controller can exchange complex data structures horizontally with other controllers independent of the fieldbus system used, or vertically with other devices using an OPC UA server service oriented architecture, like an MES/ERP system in order to collect data or write new production orders to the cloud.

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