A fieldbus is a member of a family of industrial digital communication networks[1] used for real-time distributed control. Fieldbus profiles are standardized by the
International Electrotechnical Commission (IEC) as IEC 61784/61158.
A complex automated industrial system is typically structured in hierarchical levels as a distributed control system (DCS). In this hierarchy the upper levels for production managements are linked to the direct control level of programmable logic controllers (PLC) via a non-time-critical communications system (e.g. Ethernet). The fieldbus[2] links the PLCs of the direct control level to the components in the plant of the field level such as sensors, actuators, electric motors, console lights, switches, valves and contactors and replaces the direct connections via current loops or digital I/O signals. The requirement for a fieldbus are therefore time-critical and cost sensitive. Since the new millennium a number of fieldbuses based on Real-time Ethernet have been established. These have the potential to replace traditional fieldbuses in the long term.
^IEC 61158-1:2019 Industrial communication networks – Fieldbus specifications – Part 1: Overview and guidance for the IEC 61158 and IEC 61784 series. International Electrotechnical Commission (IEC). April 2019. p. 11.
^"bus". Electropedia. International Electrotechnical Commission (IEC). 2013. definition 351-56-10.
A fieldbus is a member of a family of industrial digital communication networks used for real-time distributed control. Fieldbus profiles are standardized...
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a German manufacturer in the industrial automation sector. The sensor, fieldbus, interface and connection technology provider is represented worldwide...
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into a simple PLC, or the PLC may have external I/O modules attached to a fieldbus or computer network that plugs into the PLC. The functionality of the PLC...
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disadvantages. IEC 61158-3-21: 2010, Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21...
2002 (with the US based Fieldbus Foundation to haven taken the lead in ongoing development which however promotes H1 fieldbus for process automation)...
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