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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 ?
Described by open standards IEC 61158 and IEC 61784, PROFIBUS is used for applications requiring coordinated motion and safe operation of networked industrial devices.
The heavyweight contenders are Profibus, the well-entrenched existing technology backed by process control equipment manufacturers, and the Fieldbus Foundation's largely untested IEC 61158 architecture, which shifts process control to instrumentation devices and therefore is backed by device manufacturers.
The Fieldbus Foundation's IEC 61158 model has grown from more than a decade of development work led by predominantly U.
Profibus' Bryant criticizes the Fieldbus Foundation's IEC 61158 plan as being more complicated than it needs to be, stating that while a small part of the architecture is used in the Foundation system, the majority of the model has never been tested in the field.
PROFIBUS (PROCESS FIELD BUS) which is anchored in the international standards IEC 61158 and IEC 61784 is an open, digital communication system with a wide range of applications, particularly in the fields of factory and process automation.
AIS additionally prequalified a line of PROFIBUS DP IO modules using IEC 61158, IEC 61784 standard communication protocols to meet the increasingly complex processes of machine automation system.
The product range comprises modern components and system solutions: besides a diverse range of terminal blocks and special-purpose terminals, printed circuit terminal blocks and connectors as well as interface and surge voltage protection components, hardware and software systems offer comprehensive automation solutions, based on the fieldbus system Interbus that is standardized according to IEC 61158.
NYSE:EBY) today pledged its full and unequivocal support for the current version of the IEC 61158 fieldbus standard, and for passage of a ballot regarding an analysis of technical comments in certain "no" votes on the Final Draft International Standard (FDIS) documents for the Data Link Layer (DLL) and Application Layer (AL).
The ballot by participating members of SC 65C is needed to ensure that the final decision on IEC 61158 is based on proven technical facts, not on information supplied by opponents of the standard," Mr.