Siemens SIMATIC HMI TP 170A Equipment Manual page 103

Screen
A screen displays all the logically related process data on the operating unit,
whereby the individual values can be modified.
Selection field
Contains a list of entries from which one can be selected on the operating unit.
Start screen
The first screen, which automatically appears after theoperating unit has started
up.
Status button
The Status button is a configurable display and operating element which can have
one of two states: ON and OFF, i.e. touched and untouched. Text or graphics
can be configured for both states which then appear on the Status buto
Status/Force tag
Screen object with which individual address areas in the connected SIMATIC S5 or
SIMATIC S7 can be accessed for reading and writing directly from the operating
unit.
Superuser
A user with permissions to trigger functions of the highest password level. The
superuser has access to all the operating unit functions.
System message
Provides information on the operating unit concerning internal statuses of the
operating unit and PLC.
TP 170A Equipment Manual
Release 12/99
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