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Although 4–20 mA has been the main field signalling standard, modern DCS systems can also support [[fieldbus]] digital protocols, such as Foundation Fieldbus, profibus, HART, Modbus, PC Link etc., and other digital communication protocols such as [[modbus]].
Modern DCSs also support [[Artificial neural network|neural networks]] and [[fuzzy logic]] applications. Recent research focuses on the synthesis of optimal distributed controllers, which optimizes a certain [[H-infinity methods in control theory|H-infinity]] or the H 2 control criterion.<ref>{{Cite journal|url = |title = Distributed Control Design for Spatially Interconnected Systems|last = D'Andrea|first = Raffaello |date = 9 September 2003|journal = IEEE Transactions on Automatic Control|volume = 48|issue = 9|pages = 1478–1495|doi = 10.1109/tac.2003.816954 |citeseerx = 10.1.1.100.6721}}</ref><ref>{{Cite journal|url = http://resolver.tudelft.nl/uuid:2a1e3740-454f-4a1e-bd0d-cda8846eadae|title = Distributed Control for Identical Dynamically Coupled Systems: A Decomposition Approach|last = Massiaoni|first = Paolo|date = 1 January 2009|journal = IEEE Transactions on Automatic Control|volume = 54|pages = 124–135|doi = 10.1109/tac.2008.2009574 }}</ref>
==Typical applications==
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