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(1) A control network used in process control and industrial automation. Fieldbuses are bi-directional, digital serial networks that offer services at layers 1 and 2 of the OSI model (physical and data link). Some fieldbuses offer services at layer 7 as well. Examples of fieldbus networks are FOUNDATION fieldbus, DeviceNet, ControlNet, Modbus and PROFIBUS. In the 1980s, fieldbuses began to replace the parallel wiring used in 4-20 mA and +/-10 volt analog interfaces.

(2) (FOUNDATION fieldbus) A control network typically used in the process control industries from the Fieldbus Foundation (FF). Using a distributed architecture where the control is in the devices themselves, FOUNDATION fieldbus integrates low-speed sensors and actuators with high-speed controllers and servers in a single system. FOUNDATION fieldbus is made up of two networks: lower-speed H1 and high-speed HSE.

H1 is a bus-powered, serial, multi-drop topology at 31.25 Kbps that replaces 4-20 mA circuits, but can communicate with 4-20 mA devices via converters. Introduced in 1995, H1 provides services at layers 1, 2 and 7 of the OSI model.

HSE (High Speed Ethernet) provides 100 Mbps between PLCs, servers and workstations. It also connects to H1 networks via the linking device that multiplexes H1 segments together. Introduced in 2000, HSE provides services at layers 1, 2, 3, 4 (Ethernet and TCP/IP) and layer 7 of the OSI model. For more information, visit

References in periodicals archive ?
Both HART and FOUNDATION Fieldbus instrumentation can use current plant wiring already in place.
FOUNDATION Fieldbus is the dominant industrial network in the oil, gas and petrochemical industries as well as most process industries.
com/prnh/20130307/600769 A Fieldbus is a two-way communication digital network operating in physical, data and application layers of the OSI model.
After evaluating suppliers, Aarbus Olie chose PlantWeb[R] digital plant architecture from Emerson Process Management, with the DeltaV[TM] digital automation system, and FOUNDATION[TM] fieldbus communications technology.
The MFI adapters are available in two forms: a small external module that connects to the serial interface on the blender controller and to the cable linked to the fieldbus system in the plant, and an internal card that replaces the standard RS232 serial port in the blender controller.
As for the transmitters, our client has used both Yokogawa and Rosemount transmitters before and requested both manufacturers be on the list of acceptable suppliers for fieldbus transmitters.
The controller has a cycle time of just 1 ms - making it one of the fastest on the market - and can be supplied configured as a fieldbus slave or as a CAN master for controlling other CANopen devices, such as electric drives.
com has added a new market research report: Global Fieldbus Solution Market for Process Industry 2014-2018 https://www.
Users are realizing the importance of customized fieldbus systems and hence, consider factors beyond cost and maintenance
This new version of Centum VP offers enhanced information visibility, a more intuitive operator interface, improved consolidated alarm management, a new Foundation fieldbus engineering function, and linkage with the ProSafe-RS Safety Instrumented System (SIS).
Phoenix Contact has introduced a line of modular fieldbus components that offer connectivity from the fieldbus process controller to the field devices.
The new machine also features Automa's new Advanced Architecture Machine Controller, which is based on an industrial PC with I/O modules connected via a CANopen fieldbus.