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FOUNDATION fieldbus is an all-digital, serial, two-way communications system that serves as the base-level network in a plant or factory automation environment. Developed and administered by the Fieldbus Foundation. A digital system is one that uses discrete values (often electrical voltages), especially those representable as binary numbers, or non-numeric symbols such as letters or icons, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (ie, as in an analog system). ...
It has been suggested that this article be split into multiple articles accessible from a disambiguation page. ...
A telecommunications network is a network of telecommunications links arranged so that messages may be passed from one part of the network to another over multiple links. ...
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The Fieldbus Foundation is the leading organization dedicated to a single international, interoperable fieldbus standard. ...
It's targeted for applications using basic and advanced regulatory control, and for much of the discrete control associated with those functions.
Two related implementations of FOUNDATION fieldbus have been introduced to meet different needs within the process automation environment. These two implementations use different physical media and communication speeds. A Fieldbus is an industrial network system for real-time distributed control. ...
- H1 works at 31.25 kbit/s and generally connects to field devices. It provides communication and power over standard twisted-pair wiring. H1 is currently the most common implementation.
- HSE (High-speed Ethernet) works at 100 Mbit/s and generally connects input/output subsystems, host systems, linking devices, gateways, and field devices using standard Ethernet cabling. It doesn't currently provide power over the cable, although work is under way to address this.
FOUNDATION fieldbus was originally intended as a replacement for the 4-20 mA standard, but many delays in its development have prevented its large scale use, and has allowed other technologies such as Modbus, Profibus, and Industrial Ethernet to gain large installed bases. FOUNDATION fieldbus was developed over a period of many years by the Instrumentation, Systems, and Automation Society, or ISA, as SP50. In 1996 the first H1 (31.25kbps) specifications were released. In 1999 the first HSE (High Speed Ethernet) specifications [1] were released. One of the pioneers of fieldbus was the Brazilian company Smar. 4-20 ma is an analog electrical transmission standard for industrial instrumentation. ...
Modbus is a serial communications protocol published by Modicon in 1979 for use with its programmable logic controllers (PLCs). ...
PROFIBUS (Process Field Bus) is the most popular type of fieldbus with worldwide more than 10 million nodes (2004) in use. ...
Industrial Ethernet is the name given to the use of the Ethernet protocol in an industrial environment, for automation and production machine control. ...
The Instrumentation, Systems, and Automation Society is a professional organization for instrument engineers that was originally known as the Instrument Society of America. ...
See also
Fieldbus A Fieldbus is an industrial network system for real-time distributed control. ...
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