Omron NT21 Reference Manual page 33

Functions of the NT21, NT31/NT31C and NT631/NT631C
Lamps
Library data contain combinations of fixed display graphics registered as a
single graphic. They are registered in advance and as many as required can be
displayed at any position on the screen.
Since it is generated by combining graphics, library data has a small data size.
Mark
These are graphics whose display status changes in accordance with the states
of bits at the host. Squares, circles, sectors and polygons can be used for lamps
(normal (standard) lamps). In accordance with the status of the host bit, they can
be lit (displayed in reverse video) or flashed (repeated alternation between nor-
mal and reverse video display states).
Lamps can also display different image/library data for the ON and OFF states of
the host bit (such lamps are called image/library lamps).
There are four standard lamp guide characters: fixed display character strings,
ON/OFF switching character strings, numeral displays, and character string dis-
plays. When fixed display character strings or ON/OFF switching character
strings are used, several lines of guide characters can be displayed.
Normal (Standard) Lamps
Unlit state
Image/Library Lamps
Unlit state
Touch Switches
These switches can be set at any location on the screen. Pressing a touch switch
on the screen where a touch switch has been set can have the following effects:
Notification to a host bit (input notification function)
Changing the displayed screen (screen switching function)
Input of a numeric value or character string (input key function)
Copying of a numeric value or character string (copy key function)
Shifting to another numeric value or character string input field (cursor moving
key function)
Obtaining a hard copy of the screen (screen print function)
Opening / Closing a window
Moving a window
Image data
ON
ON
Host
ON
Host
Section 1-2
Library data
Lit state
Lit state
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