Siemens TP27 Equipment Manual page 26

General Operation
Fixed window The fixed window can be used to display important process magnitudes or date
and time, since the contents are not affected by the screen currently open.
Main area
The main area comprises the entire display. It is superimposed by all other
areas (fixed window, message window etc.). The main area contains the current
contents of the screen that is currently open.
Buttons The functions configured for the buttons have a local significance in the main
area. Buttons of local significance initiate different actions from screen to
screen on the Touch Panel or on the PLC, such as enabling and disabling Select
Screen, Language Switch or message logging. If buttons are positioned in the
fixed window, their functions are available globally. This means, for example,
that the current screen can be printed (Print Screen) or the system returned to
the main screen from any operating situation.
Buttons may have text or graphic labels. Examples:
Light indicators
Light indicators are configurable, non–operable display elements. A light indi-
cator signals the status of a defined bit by assigning dynamic attributes, for
example a change of color or flashing text.
No function is assigned to a light indicator. Light indicators have thin borders
to distinguish them from user–operable buttons.
Light indicators can be positioned locally in the main area or globally in the
fixed window.
3-2
Temperature
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TP27, TP37 Equipment Manual
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