Fieldbus standards come up to date

An IEC (International Electrotechnical Commission) product story

Edited by the Engineeringtalk editorial team Jan 24, 2008

New edition includes profiles for Real-Time Ethernet fieldbus networks, together with other industry sector network profiles which had not been included in the previous editions.

The latest series of IEC Fieldbus Standards respond to the latest technologies available.

Since the last edition published in 2003, the automation world has seen the emergence of new Ethernet-based fieldbus, intended to complement the existing fieldbus, and the installation of programmable and networked equipment in safety-related applications.

To follow this evolution, the new edition includes profiles for these Real-Time Ethernet fieldbus, together with other industry sector network profiles which had not been included in the previous editions.

This new edition has also added profiles specifically designed for the use of fieldbus technology to transmit safety-related data.

Finally, the need for more guidance in the installation of fieldbus has been addressed by defining a basic guidance for the installation of communication networks in industrial premises (IEC61918) and dedicated parts of the IEC Fieldbus Standards that for each fieldbus technology establish which options of the basic guidance apply and which additional guidance shall be used.

The IEC Fieldbus Standards provide a variety of established solutions that cover a wide range of application requirements, from process control to manufacturing automation.

These solutions have been contributed from the industry players in Europe, America, and Asia-Pacific.

An industrial manufacturer or machine/process supplier may choose from these solutions the one that is best suited for the specific needs of the application and the environment in which it is to be implemented.

This selection is facilitated by the harmonised terminology and Open Systems Interconnection (OSI)-based structure of the protocol specifications used in the IEC Standards.

The 79 IEC Fieldbus Standards are broken down into 15 communication profile families, comprising: Foundation Fieldbus, CIP, Profibus/Profinet, P-Net, WorldFIP, Interbus, CC-Link, Hart, Vnet/IP, TCnet, EtherCAT, Ethernet Powerlink, EPA, Modbus-RTPS and Sercos.

Commenting on the publication of the IEC Fieldbus Standards, Secretary of IEC Technical Subcommittee 65C, Industrial Networks, Bernard Dumortier said: "The IEC Fieldbus Standards have been a challenge for the IEC in that the technology goes across a whole range of technologies traditionally covered by different expert groups".

"It was the first system type challenge to the previous automation product centric approach within the IEC technical committee".

The IEC Fieldbus Standards development introduced new system perspectives, new technology and challenged the IEC structure of vertical product-centric technical committees at the time.

The IEC Fieldbus Standards have to facilitate connecting multiple devices of different capability and also meet a wide variety of specific application requirements in a wide variety of industries.

The resulting solution although not elegant to the standards purist, meets the practical needs of industry and has evolved successfully to incorporate new technologies, and new features such as safety.

The lessons learned from development of the IEC Fieldbus Standards are being taken into account for other technologies, including nanotechnologies, environment, energy, safety and security, where system standards may have to meet similar diverse application and industry automation needs while integrating existing controllers, sensors, actuators and transducers product standards.