Fieldbus Foundation announces updates to the technical specification
March 2013
News
The Fieldbus Foundation has announced the latest updates to its open, non-proprietary Foundation fieldbus specifications. These updates help automate device replacement and enable backwards compatibility among different revisions of Foundation devices used in plant automation systems. End users will benefit from greater predictability in fieldbus implementation, while reducing integration risks and eliminating manual intervention for device configuration.
The most significant updates to the Foundation technical specifications are a revised series of function block and transducer block profiles, as well as requirements for H1 (31,25 kbit/s) device replacement that are now part of the Fieldbus Foundation’s device registration process. This enhancement enables the H1 interoperability test kit to verify consistent behaviour between device and host implementations in fieldbus based control systems.
End users are seeking increasingly automated replacement of intelligent devices. Device replacement automation makes it easier to reproduce an existing Foundation device configuration (including function blocks and parameters) in a newer instrument by enabling a minimum set of functionality to exist so end users can get their process back up and running quickly and simply. This enhancement allows for final configuration to be completed after other critical tasks associated with the process outage have been addressed. This saves time and money and simplifies stocking of replacement devices.
Fieldbus Foundation director-fieldbus products, Stephen Mitschke, commented, “The Foundation recognises that ease of device replacement is an important concern for engineers and technicians in process plants. We see these updated specifications as a valuable opportunity and a first step in a series of things we can do to provide more value to the end users. It is another example of our commitment to continuous improvement and being an end user driven standard.“
Automation of device replacement allows the configuration in an existing field device to be restored in a newer version of that instrument without manual intervention. This ‘plug and play’ solution ensures features are consistent between different generations of devices without reengineering the host configuration or changing any other element of the H1 network other than the new instrument.
In addition to device replacement, the specification update provides improved positioner profile in fieldbus devices. This technology supports organisation and integration of advanced device diagnostics within fieldbus systems. It provides standard definitions for positioner transducer blocks and includes parameter structure definitions for better data organisation with fieldbus devices, including partial/full stroke test (PST/FST) of valves.
The new specification release also includes definitions for discrete process variables clarifying how variable values are interpreted in conjunction with state tables, as well as several new or updated application and technical notes.
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