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In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. Only one current level can be present at any time. A major application of current loops is the industry de facto standard 4–20 mA current loop for process control applications, where they are extensively used to carry signals from process instrumentation to PID controllers, SCADA systems, and programmable logic controllers (PLCs). They are also used to transmit controller outputs to the modulating field devices such as control valves. These loops have the advantages of simplicity and noise immunity, and have a large international user and equipment supplier base. Some 4–20 mA field devices can be powered by the current loop itself, removing the need for

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rdfs:label	Current loop (en)
rdfs:comment	In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. Only one current level can be present at any time. A major application of current loops is the industry de facto standard 4–20 mA current loop for process control applications, where they are extensively used to carry signals from process instrumentation to PID controllers, SCADA systems, and programmable logic controllers (PLCs). They are also used to transmit controller outputs to the modulating field devices such as control valves. These loops have the advantages of simplicity and noise immunity, and have a large international user and equipment supplier base. Some 4–20 mA field devices can be powered by the current loop itself, removing the need for (en)
sameAs	Current loop Current loop
dbp:wikiPageUsesTemplate	dbt:About dbt:Cite_web dbt:ISBN dbt:Snd
Subject	Communication circuits Control engineering Electronics standards Industrial automation Analog communication interfaces
Link from a Wikipage to an external page	http://celesco.com/faq/420.htm http://www.murata-ps.com/data/meters/dms-an20.pdf https://ncd.io/reading-4-20ma-current-loop-sensors-using-arduino/ http://www.ni.com/white-paper/6940/en/ http://www.allaboutcircuits.com/vol_1/chpt_9/3.html
thumbnail	wiki-commons:Special:FilePath/Analogue_control_loop_evolution.png?width=300
foaf:depiction
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Current_loop?oldid=1049117064&ns=0
Wikipage page ID	1174172 (xsd:integer)
page length (characters) of wiki page	14113 (xsd:nonNegativeInteger)
Wikipage revision ID	1049117064 (xsd:integer)
Link from a Wikipage to another Wikipage	NAMUR Process control Programmable logic controller Actuator Analog signal Base station Bell System Taxi Two-way radio Volumetric flow rate Communication circuits Control engineering Electronics standards Industrial automation Dispatcher Dry loop PH PID controller Chart recorder Current source De facto standard Piping and instrumentation diagram Pressure Control valve Highway Addressable Remote Transducer Protocol List of automation protocols SCADA Planetary equilibrium temperature Instrumentation Traffic light Transimpedance amplifier Analog communication interfaces Tone remote Signal Siren (alarm)
has abstract	In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. Only one current level can be present at any time. A major application of current loops is the industry de facto standard 4–20 mA current loop for process control applications, where they are extensively used to carry signals from process instrumentation to PID controllers, SCADA systems, and programmable logic controllers (PLCs). They are also used to transmit controller outputs to the modulating field devices such as control valves. These loops have the advantages of simplicity and noise immunity, and have a large international user and equipment supplier base. Some 4–20 mA field devices can be powered by the current loop itself, removing the need for separate power supplies, and the "smart" HART protocol uses the loop for communications between field devices and controllers. Various automation protocols may replace analog current loops, but 4–20 mA is still a principal industrial standard. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Current_loop
is Wikipage redirect of	Four to twenty milliampere loop Active current loop Passive current loop 4-20 mA 4-20 mA loop 4-20 ma 4-20mA 4-20mA current loop
is Link from a Wikipage to another Wikipage of	Foundation Fieldbus Foundation Fieldbus H1 AT&T Internet Access control Alarm management Base station Bombardier Innovia Metro Building automation Dick Smith Super-80 Computer Differential signalling Distributed control system Dry loop Current source DECwriter De facto standard Computer Automation Control valve Highway Addressable Remote Transducer Protocol List of computing and IT abbreviations Microprocessor development board Electricity meter Electronika BK Gasoline pump IEC 62056

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