Siemens Argus 7SR21 Technical Manual page 24

7SR210 & 7SR220 Description of Operation
Function Keys/ LEDs (Ordering Option)
Six additional programmable pushbuttons can be specified. These can be configured by the user to initiate
selected functions from the Control menu (INPUT CONFIG > FUNCTION KEY MATRIX).
Each pushbutton has an associated LED. LEDs can be programmed as hand or self reset and can be illuminated
as green, yellow or red (OUTPUT CONFIG > LED CONFIG).
Function keys can be used with Quick Logic.
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