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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

AttributesValues
rdf:type
rdfs:label
  • Bucle de corrent (PID) (ca)
  • Stromschnittstelle (de)
  • Lazo de corriente (es)
  • Current loop (en)
  • Boucle de courant (fr)
  • Stroomlus (nl)
  • 電流環 (zh)
rdfs:comment
  • La boucle de courant est une méthode utilisée en contrôle industriel pour communiquer avec des capteurs ou des actionneurs, consistant à faire circuler dans une paire de conducteurs électriques un courant dont l'intensité est l'image du signal à transmettre. (fr)
  • 電流環是一種類比的電子信号，可以用二條導線進行遠端監控或是控制的應用，利用電流來傳遞訊號，線上同一時間只會有一個電流命令。 電流環主要的應用是用在过程控制應用中的業界標準 4–20 mA電流環，廣泛的用在儀表和PID控制器、数据采集与监控系统（SCADA）以及可编程逻辑控制器（PLC）之間的信號傳輸。4–20 mA信號也用來傳送控制器輸出給調變的現場設備（例如）。電流環的好處是簡單，並且抗雜訊能力高。在國際上有大量的使用者以及設備供應商。有些4–20 mA現場設備可以用電流環供電，不需額外的電源，而HART通訊協定利用電流環進行設備和控制器之間的通訊。有許多自動化通訊協定可以取代類比的電流環，但4–20 mA仍然是主要的工業標準之一。 (zh)
  • Eine Stromschnittstelle oder Stromschleifenschnittstelle arbeitet mit einer Stromanpassung. Sie wird zur Informationsübertragung in rauer Umgebung verwendet, wo mit hohen Störpegeln gerechnet werden muss, so dass die sonst übliche Übertragung mittels Spannungspegeln (Spannungsanpassung) nicht mit ausreichender Zuverlässigkeit arbeitet. Analoge Telefone in industriellen Anwendungen sowie bei elektronischen Musikinstrumenten (MIDI) arbeiten vorzugsweise mittels eines eingeprägten elektrischen Stroms. Markant waren auch Fernschreiber. (de)
  • 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)
  • El lazo de corriente o bucle de corriente es un método utilizado en el control industrial para comunicarse con sensores o actuadores, que consiste en hacer circular una corriente en un par de conductores eléctricos, cuya intensidad es la imagen proporcional de la señal a transmitir. Como en el caso del lazo de tensión, la norma ANSI/ISA-S50.1-1982 (Rev. 1992) recoge dos casos típicos de bucles de corriente, el lazo de corriente 0-20 mA y, el más ampliamente utilizado en el entorno industrial, el lazo de corriente 4-20 mA.​ (es)
  • Een 4-20mA-stroomlus is een tweedraads elektrische verbinding, gevoed door een constante spanning van (maximaal 24 V) en aangesloten op een omvormer die een te meten grootheid omzet in een gelijkstroom tussen 4 en 20 mA. Dit is een signaaltransmissiestandaard voor industriële instrumentatie en communicatie waarbij 4 mA nul procent van de gemeten grootheid en 20 mA honderd procent voorstelt. (nl)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/Analogue_control_loop_evolution.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/T1380_remote.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Smart_current_loop_positioner.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Pl_control_valve.jpg
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