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[[File:Control-panel-plc.jpg|thumb|upright|Control panel with a PLC user interface for [[Thermal oxidiser|thermal oxidizer]] regulation]]
PLCs may need to interact with people for the purpose of configuration, alarm reporting, or everyday control. A [[SCADA#Human-machine interface|human-machine interface]]{{Broken anchor|date=2024-11-08|bot=User:Cewbot/log/20201008/configuration|target_link=SCADA#Human-machine interface|reason=Anchor "SCADA#Human-machine interface" links to a specific web page: "Human Machine Interface". The anchor (Human-machine interface) [[Special:Diff/1194043441|has been deleted]].}} (HMI) is employed for this purpose. HMIs are also referred to as man-machine interfaces (MMIs) and graphical user interfaces (GUIs). A simple system may use buttons and lights to interact with the user. Text displays are available as well as graphical touch screens. More complex systems use programming and monitoring software installed on a computer, with the PLC connected via a communication interface.
==Process of a scan cycle==
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