Functions Of Touch Switches - Omron NT20S-ST121B-EV3 User Manual

Touch Switches
4-7-1

Functions of Touch Switches

Touch Switch Attributes
Touch switches are created using rectangular elements measuring 19 dots
horizontally by 19 dots vertically. A touch switch can comprise more than one
touch switch element. Up to 72 touch switches (12 horizontally x 6 vertically)
can be registered on one screen.
PLC
When the touch switch is
pressed, bit information
is sent to the PLC.
(Host link/NT link)
• Functions of Touch Switches
Touch switches can have the following functions:
• PLC notification function:
Host link/NT link/C200H direct communications (page 196)
RS-232C (NT20-ST128) (page 224)
• Screen switch function (page 154)
• System key function (page 154)
• Numeral setting function:
Host link/NT link/C200H direct communications (page 199)
RS-232C (NT20-ST128) (page 224)
The following attributes can be set for touch switches.
• Display Frame
The area that will respond as a touch switch is displayed in the form of a
frame, as shown in the table below. One of three types of frame - standard,
3-D, and none - can be selected.
Type of Display Frame
Standard
3-D
None
If "none" is selected, only the touch switch's guide display message (or
nothing, if there is none) are displayed until a "light" or "flash" designation
is sent from the PLC/Host or the touch switch is pressed.
• Inverse Display on Input
It is possible to set a touch switch so that its display will be inverted when
it is pressed.
• Lighting and Flashing
19 dots
A touch switch can comprise more
than one touch switch element.
Host
When the touch switch is
pressed, the touch switch
number or bit information is sent
to the Host (RS-232C).
Switch OFF
Section 4-7
19 dots
Switch ON
153