E-Zine May 2010
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The Fieldbus Foundation is a non-profit membership organization with a charter to develop and support a set of specifications known as FOUNDATION™ Fieldbus H1 that is based on the ANSI/ISA 50.02 Fieldbus standard. This specification is also the same as Type 1 of the IEC 61158 international fieldbus standard. Additionally, the Fieldbus Foundation developed and supports Type 5 of IEC 61158, which is known as FOUNDATION™ Fieldbus HSE. Further, the Fieldbus Foundation contributed its function block specifications to the ongoing work of IEC SC65C/WG7 to develop the recently approved standard IEC 61804, Function Blocks for Process Control.
Not only does the Fieldbus Foundation support these specifications, but also it develops and administers tests to ensure compliance with these specifications. This allows fieldbus-based control systems supplied by one supplier to be used with field instruments and control valves from many different suppliers.
Devices and systems meeting all of the testing requirements, receive an official registration mark that is affixed to the device or system.
Suppliers are allowed to extend their products and systems in specific ways that maintain interoperability. While suppliers must implement the basic function blocks specified in the standard as specified by the Foundation, additional function blocks may be developed where the attributes of the function blocks are defined using a standardized Device Description. No interoperability testing is done on the Device Description, but the behavior of the Device Description is specified by the Foundation.
Excerpted from The Consumer Guide to Fieldbus Network Equipment for Process Control