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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 ?
A list of fieldbuses [31] includes the following: AS-i, BSAP--Bristol Standard Asynchronous Protocol, CC-Link Industrial Networks, CIP (Common Industrial Protocol), CANOpen, DeviceNet, ControlNet, DF-1, DirectNet, EtherCAT, Ethernet Global Data (EGD), EtherNet/IP, Ethernet Powerlink, FOUNDATION fieldbus--H1 & HSE, HART, HostLink, Interbus, MACRO Fieldbus, MECHATROLINK, MelsecNet, Modbus, Optomux, PieP, Profibus, PROFINET IO, RAPIEnet, Honeywell SDS, SERCOS III, SERCOS interface, GE SRTP, Sinec H1, SynqNet, TTEthernet.
For more information on the Brad applicomIO fieldbus Network Interface Card (NIC) please visit www.
The Global Fieldbus Solution market for the Process Industry can be segmented into three technological segments: Foundation Fieldbus, Profibus PA, and Others.
Fieldbus cables, on the other hand, are round and much larger.
It is certified by all major digital control system suppliers, the FDT Group and the Fieldbus Foundation.
The number of devices possible on a fieldbus link will vary depending on factors such as the power consumption of each device, the use of repeaters, signal attenuation, type of cable used and distance, the company said.
With a low 9-VDC supply current and 45-psi air supply for any valve/actuator platform, the 3400IQ makes installation of the Foundation Fieldbus easy, says the company.
Templates of screens, logic, and data are all part of the AAS package, along with HMI, fieldbus I/O, axis management, RFID, and support for third-party devices.
Digitally networked pressure sensors send data back and forth continuously through a single fieldbus cable, providing closed-loop, real-time control of all the devices in the network by an industrial PC, which may double as the operator interface.
The C6340 and C6350 IPCs have 3 free PCI slots on the 5-slot passive backplane that can be used for extra PC fieldbus cards in systems with parallel fieldbus usage.
This edition has been updated to include chapters on the fieldbus standards, reliability, EMC, 'virtual instrumentation', fiber optics, smart and intelligent transmitters, analyzers, level and flow meters, and many more.
The Fieldline Modular I/O machine mount connects to fieldbus protocols and provides a solution where high concentrations of I/O, or a variety of signal types, are required.