View source for Programmable Logic Controller

programmable controller | régulateur programmable |  جهاز تحكم مبرمج | programmierbarer Regler | autómata programmable | controlador lógico programmable | ohjelmoitava ohjauslaite | controllore programmabile | プログラマブルコントローラ | sterownik programowalny | regulator programowalny | controlador programável | PLC | 可编程控制器 <br/><br/>


==Definitions==
<!--=== European Definitions ===


=== Other International Definitions ===
Test test test. 

=== National Definitions ===
==== Germany====

-->
===Standard Definition===
===National Definitions ===
==== [[United States]] ====
===== [[NIST]] =====
PLCs are computer-based solid-state devices that control industrial equipment and processes. While PLCs are control system components used throughout SCADA and DCS systems, they are often the primary components in smaller control system configurations used to provide operational control of discrete processes such as automobile assembly lines and power plant soot blower controls. PLCs are used extensively in almost all industrial processes <ref name="NIST">[http://csrc.nist.gov/publications/nistpubs/800-82/SP800-82-final.pdf K. Stouffer, J. Falco, K. Kent, Guide to Industrial Control Systems (ICS) Security, NIST Special Publication 800-82, June 2011]</ref>. PLCs are used in both [[SCADA]] and [[Distributed Control System|DCS]] systems as control components of an overall hierarchical system to provide local management of processes through feedback control. In the case of [[SCADA]] systems, they provide the same functionality of [[Remote Terminal Unit|RTUs]]. When used in [[Distributed Control System|DCS]], PLCs are implemented as local controllers with in a supervisory control scheme. PLCs are also implemented as the primary components in smaller control system configurations. PLCs have a user-programmable memory for storing instructions for the purpose of implementing specific functions such as I/O control, logic, timing, counting, three mode proportional-integral-derivative (PID) control, communication, arithmetic, and data and file processing <ref name="NIST">[http://csrc.nist.gov/publications/nistpubs/800-82/SP800-82-final.pdf K. Stouffer, J. Falco, K. Kent, Guide to Industrial Control Systems (ICS) Security, NIST Special Publication 800-82, June 2011]</ref>.
=== Standard Definitions ===
==== [[IEC]] ====
{{definition|Programmable controller is a microprocessor-based controller with a programmable memory for the internal storage of user-defined instructions. <ref name=IEV>[http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=351-56-25 IEC IEV 351-56-25]</ref>}}<br/>
{{definition|Régulateur programmable: régulateur à base de microprocesseurs comportant une mémoire programmable pour la mémorisation interne d'instructions définies par l'utilisateur <ref name=IEV>[http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=351-56-25 IEC IEV 351-56-25]</ref>}}<br/>
==See also==
* [[Industrial Automation Control System]] 
* [[Remote Terminal Unit]]
* [[SCADA]]

==Notes==
<references />

==References==
* ERNCIP's Thematic Group on Case Studies for the Cyber-Security of Industrial Automation and Control Systems [https://erncip-project.jrc.ec.europa.eu/networks/tgs/ics-use-cases]

[[Category:System]]
{{#set:defined by=NIST|defined by=IEC}}
{{#set: Showmainpage=Yes}}