Omron NT31

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If switches A, B, and C come ON at the same time,
touch switch D will also come ON due to the touch
switch mechanism.
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If switches A, B, and D come ON at the same time,
touch switch C will also come ON due to the touch
switch mechanism.
A C
BD
Smallest touch switch frame
335
Touch Switches
Section 7-7
Reference
- Caution on pressing three touch switches
When multiple touch switches are arranged as shown in the example below and
the three are pressed at the same time, a malfunction will occur due to a pecu-
liarity of the touch switch mechanism.
Be careful how you arrange touch switches.
Example:
When touch switches are created at positions A and B and at one of
the points of intersection C or D
S Functions that can be set for touch switches
Any of the following functions can be set for touch switches. For details, refer to
“Processing Functions” (page 343).
S Host notification function
Whena touchswitch is pressed,the status of a bit for notification purposes at the
host (the “notify bit”) changes.
It may change in any of the four following ways.
- Momentary
The notify bit is set to “1” (ON) only while the touch switch is pressed, and re-
turns to “0” (OFF) when the touch switch is released.
- Alternate
Each time the touch switch is pressed, the notify bit is switched to “1” (ON) if
currently set to “0” (OFF), and to “0” (OFF) if currently set to “1” (ON).
-Set
When the touch switch is pressed the notify bit is set to “1” (ON).
- Reset
When the touch switch is pressed the notify bit is set to “0” (OFF).
PC
1
1(ON)
NT31/NT31C
Bit allocated for notification
(touch switch 1)
Touchswitch1
S Screen switching function
When a touch switch is pressed, the display switches to the set screen.