(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 www.fieldbus.org.
(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 www.fieldbus.org.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Precision of Ethernet Measurements Based on Software Tools
- More and more, Ethernet based fieldbuses are used in practical applications. There is the promise that Ethernet based solutions will be more flexible and permit the end user a smooth integration of his field equipment in the IT world. Furthermore, there is hope that the theoretically faster Ethernet technology will...
- White papers 2007-09-29
- A Universal Approach for Implementing Real-Time Industrial Ethernet
- "Industrial Ethernet" is a broad term that generally refers to two distinct types of networking: Non- or Soft-Real-Time SRT, which is primarily characterized by information processing and Isochronous Real-Time IRT, which offers deterministic control messaging for high performance factory floor equipment. In a production environment, there may be a machine...
- White papers 2007-09-17
- Open Architecture Physical Layer Diagnostics Speed Installation and Reduce Downtime
- Hand-held test tools have been used routinely on the world's major fieldbus installations to speed the installation process by diagnosing wiring errors prior to start-up. In response to end-user feedback, recent enhancements have delivered better features such as noise measurement in multiple frequency bands and the ability to store field...
- White papers 2007-03-15
- High Speed Ethernet: Promoting Openness in Hybrid Control
- Many tasks in Process Automation require a combination of continuous and sequential control. Developments in Ethernet-based backbones, however, are increasingly addressing the problems of high-speed, real-time Factory Automation only. There is one exception: FOUNDATION Fieldbus High Speed Ethernet. This paper shows, on the basis of practical examples, how High Speed...
- White papers 2006-10-19
- Wireless Technology in Industrial Networks
- Selected issues related to wireless fieldbus systems have been discussed in this paper. Wireless technologies can bring many benefits to industrial applications, one of them being the ability to reduce machine setup times by avoiding cabling. The market offers mature wireless solutions, such as the IEEE 802.11 standard, the IEEE...
- White papers 2005-06-01
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