Programmable logic controller: Difference between revisions

Revision as of 03:45, 27 August 2024

Revision as of 15:02, 7 October 2024

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{{Short description|Programmable digital computer used to control machinery}}

{{Use American English|date=September 2023}}

[[File:Automate industriel WAGO pour un système de monitoring en industrie pharmaceutique.jpg|thumb|PLCs for a monitoring system in the pharmaceutical industry]]

{{Manufacturing}}

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PLCs require a programming device which is used to develop and later download the created program into the memory of the controller.<ref name=":4" />

Modern PLCs generally contain a [[real-time operating system]], such as [[OS-9]] or [[VxWorks]].<ref name=":5" /><!--[[User:Kvng/RTH]]-->

===Mechanical design===

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[[File:PLC AB InstaladoV1.JPG|alt=Modular PLC with EtherNet/IP module, digital and analog I/O, with some slots being empty.|thumb|Modular PLC with [[EtherNet/IP]] module, discrete and analog I/O, with some slots being empty]]

There are two types of mechanical design for PLC systems. A ''single box'', or(also called a ''brick'') is a small programmable controller that fits all units and interfaces into one compact casing, although, typically, additional expansion modules for inputs and outputs are available. SecondThe second design type –{{snd}} a ''modular'' PLC –{{snd}} has a chassis (also called a ''rack'') that provides space for modules with different functions, such as power supply, processor, selection of I/O modules and communication interfaces –{{snd}} which all can be customized for the particular application.<ref>{{Harvnb|Bolton|2015|pp=12–13}}</ref> Several racks can be administered by a single processor and may have thousands of inputs and outputs. Either a special high-speed serial I/O link or comparable communication method is used so that racks can be distributed away from the processor, reducing the wiring costs for large plants. Options are also available to mount I/O points directly to the machine and utilize quick disconnecting cables to sensors and valves, saving time for wiring and replacing components.{{Citation needed|date=April 2020}}<!--[[User:Kvng/RTH]]-->

===Discrete and analog signals===