Screen Display; Classification Of Screens - Omron NT20S-ST121B-EV3 User Manual

Screen Display

4-3

Screen Display

4-3-1

Classification of Screens

Normal Screen
Overlapping Screen
140
This section describes the screen information required for the operation with
the NT20.
For details on how to change the displayed screen, refer to 5-1-4 Switching
the Screen Display on page 172, and Display Specified Screen on page 216.
For the methods used to ascertain the screen number of the screen currently
displayed, refer to 5-1-5 Notifying the PLC of the Display Screen (to Display
the Number of Currently Displayed Screen) on page 174, and Request
Screen Number on page 216.
The NT20 is provided with the following types of screens which are classified
by the display method.
• Normal screen
• Overlapping screen
• Continuous screen
The screen type is set with each screen in the "Screen List" screen of the
Support Tool. Select a screen type according to the purpose, and create char-
acters and figures on the screen.
A normal screen is the basic screen of the NT20. It is not necessary to select
a screen type (overlapping or consecutive) when to create the screen data on
a normal screen.
When a normal screen is selected, existing screens will be erased and a nor-
mal screen will be displayed.
Several normal screens can be overlapped and displayed as one screen. A
group of overlapped screens is called an "overlapping screen".
Several normal screens are displayed in the order of screen numbers which
have been designated to each screen and form an overlapping screen. Up to
eight screens can be overlapped to form one overlapping screen. The base
screen used for making an overlapping screen is called a "parent screen", and
a bunch of screens which are laid over the parent screen are called "child
screens".
All display elements can be used on a parent screen.
The screen attributes such as a buzzer attribute set in the parent screen
become effective in an overlapping screen.
Example Overlapping Screens
(1)
Screen #8
This is an
(2)
overlapping
screen.
(3)
• Parent screen: #8
• Child screens: #10, #7, and #25
Screen #10
This is an
Screen #7
overlapping
Screen #25
screen.
Section 4-3