Screen Switching Function; System Key Functions - Omron NT20 User Manual

Touch Switches
4-7-2

Screen Switching Function

Note
4-7-3

System Key Functions

Allocation of System Key
Functions
154
It is possible to specify whether the touch switch will be lit continuously or
flash when the bit allocated to it is turned ON by the PLC/Host.
• Presence/Absence of a Guide Display
A guide display message can be displayed at a touch switch location.
The NT20 has a function that allows screens to be switched by pressing touch
switches on its screen, rather than by designation from the PLC/Host. This
function is called the "standalone function".
The screen number of the screen that will be displayed when a touch switch is
pressed is set for that touch switch when the screen data is created using the
Support Tool.
If the touch switch is pressed during operation, the screen whose number was
designated will be displayed. Simultaneously, the PLC/Host will be notified of
the screen number of the screen selected for display.
To next screen
"Screen #5" set for touch switch 1
To set a screen number for a touch switch, use "Touch SW", "Bit specification"
and "Screen switch" of the Support Tool.
Only one screen number can be set for one touch switch within one screen (or
within one overlapping screen).
The NT20 allows the allocation of "system key" functions to touch switches.
The system key functions can then be used during operation by pressing the
touch switches to which they have been allocated.
For example, if, when a screen for which buzzer sounding has been set is dis-
played, a touch switch is also displayed, the buzzer can be stopped by
pressing this touch switch.
To set a system key function for a touch switch, use "Touch SW", "Bit specifi-
cation" and "Numeric key" of the Support Tool.
The system key functions are allocated to touch switch numbers 227 to 230
and 255, as shown below. When a touch switch with one of these numbers is
displayed on the screen, it has the same function as the corresponding sys-
tem key.
System Key
System menu display
[Buzzer stop]
[ENT]
Touch switch
pressed once
Screen #5
Key Symbol Touch Switch No.
227
MENU
228
229
230
255
Section 4-7